I'm trying to find a small MSP430 part that has both a UART and
SPI hardware (1 each). I need 2KB of flash and 256B of RAM and
about 5 I/O lines (in addition to the UART/SPI). Small size is
important.
I've been fighting with the the part selector web page for a
while and haven't been able to find such a part. But, it
doesn't seem possible to specify 1 SPI and 1 UART, so I may
have missed something.
Is anybody aware of a small part with both a UART and an SPI
interface?
--
Grant Edwards grante Yow! I'm encased in
the
at lining of a pure pork
visi.com sausage!!
Small msp430 part w/ UART + SPI?
Started by ●October 10, 2007
Reply by ●October 10, 20072007-10-10
On 2007-10-10, Aaron Greer wrote:
> I think this one will do what you want:
> http://focus.ti.com/docs/prod/folders/print/msp430f2272.html
> AFAIK the USCI will handle one each of UART and SPI.
Thanks for the pointer. That part would definitely work, but
it's a bit large. I'm not sure it will fit on the board.
--
Grant Edwards grante Yow! I just had my entire
at INTESTINAL TRACT coated
visi.com with TEFLON!
> I think this one will do what you want:
> http://focus.ti.com/docs/prod/folders/print/msp430f2272.html
> AFAIK the USCI will handle one each of UART and SPI.
Thanks for the pointer. That part would definitely work, but
it's a bit large. I'm not sure it will fit on the board.
--
Grant Edwards grante Yow! I just had my entire
at INTESTINAL TRACT coated
visi.com with TEFLON!
Reply by ●October 10, 20072007-10-10
On 2007-10-10, Microbit wrote:
> Hi Grant,
>
> AFAIK you have to turn to the bigger buggers because SPI is
> treated as a USART, unless I've missed some newer part.
Some of the smaller parts have a USI (which will do SPI or
I2C), but I also need a UART.
> But I guess you already knew that / were afraid of that :-) I
> guess that's where little buggers like the AVR are good, they
> always come with SPI HW regardless of other periphs.
Yea, I've been looking at the ATtiny48 family but they're
_expensive_, and with AVRs interrupt handling and dealing with
16-bit timer values leaves a lot to be desired.
--
Grant Edwards grante Yow! Is it 1974? What's
at for SUPPER? Can I spend
visi.com my COLLEGE FUND in one
wild afternoon??
> Hi Grant,
>
> AFAIK you have to turn to the bigger buggers because SPI is
> treated as a USART, unless I've missed some newer part.
Some of the smaller parts have a USI (which will do SPI or
I2C), but I also need a UART.
> But I guess you already knew that / were afraid of that :-) I
> guess that's where little buggers like the AVR are good, they
> always come with SPI HW regardless of other periphs.
Yea, I've been looking at the ATtiny48 family but they're
_expensive_, and with AVRs interrupt handling and dealing with
16-bit timer values leaves a lot to be desired.
--
Grant Edwards grante Yow! Is it 1974? What's
at for SUPPER? Can I spend
visi.com my COLLEGE FUND in one
wild afternoon??
Reply by ●October 10, 20072007-10-10
True, it is a bit larger than a 14 pin TSSOP. But it's only about 6mm on a
side for the 40 pin QFN.
The 14-TSSOP is about 6.5 by 5.1mm, so not much smaller. The price is higher for the bigger part, but if you can tolerate that, I doubt the small increase in size would prevent you from using it.
----- Original Message -----
From: "Grant Edwards"
To: m...
Sent: Wednesday, October 10, 2007 3:29:18 PM (GMT-0700) America/Denver
Subject: [msp430] Re: Small msp430 part w/ UART + SPI?
On 2007-10-10, Aaron Greer < a...@qsicorp.com > wrote:
> I think this one will do what you want:
> http://focus.ti.com/docs/prod/folders/print/msp430f2272.html
> AFAIK the USCI will handle one each of UART and SPI.
Thanks for the pointer. That part would definitely work, but
it's a bit large. I'm not sure it will fit on the board.
--
Grant Edwards grante Yow! I just had my entire
at INTESTINAL TRACT coated
visi.com with TEFLON!
--
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The 14-TSSOP is about 6.5 by 5.1mm, so not much smaller. The price is higher for the bigger part, but if you can tolerate that, I doubt the small increase in size would prevent you from using it.
----- Original Message -----
From: "Grant Edwards"
To: m...
Sent: Wednesday, October 10, 2007 3:29:18 PM (GMT-0700) America/Denver
Subject: [msp430] Re: Small msp430 part w/ UART + SPI?
On 2007-10-10, Aaron Greer < a...@qsicorp.com > wrote:
> I think this one will do what you want:
> http://focus.ti.com/docs/prod/folders/print/msp430f2272.html
> AFAIK the USCI will handle one each of UART and SPI.
Thanks for the pointer. That part would definitely work, but
it's a bit large. I'm not sure it will fit on the board.
--
Grant Edwards grante Yow! I just had my entire
at INTESTINAL TRACT coated
visi.com with TEFLON!
--
CONFIDENTIALITY NOTICE: This communication, and any files or previous e-mail messages attached to it, is confidential information and may contain information that is privileged. It is for use of the named recipient(s) only.
Do not read this e-mail if you are not the intended recipient. If you are not the intended recipient, or a person responsible for delivering it to the intended recipient, please do not copy or disclose its contents to any person or body.
If you have received this transmission in error, please immediately notify us by e-mail and destroy the original transmission and its attachments. Thank you.
Reply by ●October 10, 20072007-10-10
Hi Grant,
AFAIK you have to turn to the bigger buggers because SPI is treated as a USART, unless I've missed
some newer part. But I guess you already knew that / were afraid of that :-)
I guess that's where little buggers like the AVR are good, they always come with SPI HW
regardless of other periphs.
Best Regards,
Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of Grant Edwards
Sent: Thursday, 11 October 2007 6:28 AM
To: m...
Subject: [msp430] Small msp430 part w/ UART + SPI?
I'm trying to find a small MSP430 part that has both a UART and
SPI hardware (1 each). I need 2KB of flash and 256B of RAM and
about 5 I/O lines (in addition to the UART/SPI). Small size is
important.
I've been fighting with the the part selector web page for a
while and haven't been able to find such a part. But, it
doesn't seem possible to specify 1 SPI and 1 UART, so I may
have missed something.
Is anybody aware of a small part with both a UART and an SPI
interface?
--
Grant Edwards grante Yow! I'm encased in the
at lining of a pure pork
visi.com sausage!!
AFAIK you have to turn to the bigger buggers because SPI is treated as a USART, unless I've missed
some newer part. But I guess you already knew that / were afraid of that :-)
I guess that's where little buggers like the AVR are good, they always come with SPI HW
regardless of other periphs.
Best Regards,
Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of Grant Edwards
Sent: Thursday, 11 October 2007 6:28 AM
To: m...
Subject: [msp430] Small msp430 part w/ UART + SPI?
I'm trying to find a small MSP430 part that has both a UART and
SPI hardware (1 each). I need 2KB of flash and 256B of RAM and
about 5 I/O lines (in addition to the UART/SPI). Small size is
important.
I've been fighting with the the part selector web page for a
while and haven't been able to find such a part. But, it
doesn't seem possible to specify 1 SPI and 1 UART, so I may
have missed something.
Is anybody aware of a small part with both a UART and an SPI
interface?
--
Grant Edwards grante Yow! I'm encased in the
at lining of a pure pork
visi.com sausage!!
Reply by ●October 10, 20072007-10-10
Let's keep this in the list if we can.
I think the OP wants to have both SPI and UART at the same time.
Using the USI won't get him that. Maybe a combo of USI and SW bit bash would though.
----- "Colin Garlick" wrote:
> It's very easy to bit-bash SPI. Particularly if you are Master.
> Also TimerA is very good at a cycle-accurate UART. So you could use
> F2011,
> and have both SPI & UART with S/w trickery ~300bytes of code (NB This
> is
> NOT
> a CPU cycle timed S/w-UART), but the USI on F20x2 is probably an
> easier
> reach.
>
> Colin,
>
> -----Original Message-----
> From: m... [mailto:m...] On
> Behalf
> Of Microbit
> Sent: 10 October 2007 21:45
> To: m...
> Subject: RE: [msp430] Small msp430 part w/ UART + SPI?
>
> Hi Grant,
>
> AFAIK you have to turn to the bigger buggers because SPI is treated as
> a
> USART, unless I've missed some newer part. But I guess you already
> knew
> that / were afraid of that :-) I guess that's where little buggers
> like
> the AVR are good, they always come with SPI HW regardless of other
> periphs.
>
> Best Regards,
> Kris
>
> -----Original Message-----
> From: m... [mailto:m...] On
> Behalf
> Of Grant Edwards
> Sent: Thursday, 11 October 2007 6:28 AM
> To: m...
> Subject: [msp430] Small msp430 part w/ UART + SPI?
>
> I'm trying to find a small MSP430 part that has both a UART and SPI
> hardware (1 each). I need 2KB of flash and 256B of RAM and about 5
> I/O
> lines (in addition to the UART/SPI). Small size is important.
>
> I've been fighting with the the part selector web page for a while
> and
> haven't been able to find such a part. But, it doesn't seem possible
> to
> specify 1 SPI and 1 UART, so I may have missed something.
>
> Is anybody aware of a small part with both a UART and an SPI
> interface?
>
> --
> Grant Edwards grante Yow! I'm encased
> in
> the
> at lining of a pure
> pork
> visi.com sausage!!
>
>
>
I think the OP wants to have both SPI and UART at the same time.
Using the USI won't get him that. Maybe a combo of USI and SW bit bash would though.
----- "Colin Garlick" wrote:
> It's very easy to bit-bash SPI. Particularly if you are Master.
> Also TimerA is very good at a cycle-accurate UART. So you could use
> F2011,
> and have both SPI & UART with S/w trickery ~300bytes of code (NB This
> is
> NOT
> a CPU cycle timed S/w-UART), but the USI on F20x2 is probably an
> easier
> reach.
>
> Colin,
>
> -----Original Message-----
> From: m... [mailto:m...] On
> Behalf
> Of Microbit
> Sent: 10 October 2007 21:45
> To: m...
> Subject: RE: [msp430] Small msp430 part w/ UART + SPI?
>
> Hi Grant,
>
> AFAIK you have to turn to the bigger buggers because SPI is treated as
> a
> USART, unless I've missed some newer part. But I guess you already
> knew
> that / were afraid of that :-) I guess that's where little buggers
> like
> the AVR are good, they always come with SPI HW regardless of other
> periphs.
>
> Best Regards,
> Kris
>
> -----Original Message-----
> From: m... [mailto:m...] On
> Behalf
> Of Grant Edwards
> Sent: Thursday, 11 October 2007 6:28 AM
> To: m...
> Subject: [msp430] Small msp430 part w/ UART + SPI?
>
> I'm trying to find a small MSP430 part that has both a UART and SPI
> hardware (1 each). I need 2KB of flash and 256B of RAM and about 5
> I/O
> lines (in addition to the UART/SPI). Small size is important.
>
> I've been fighting with the the part selector web page for a while
> and
> haven't been able to find such a part. But, it doesn't seem possible
> to
> specify 1 SPI and 1 UART, so I may have missed something.
>
> Is anybody aware of a small part with both a UART and an SPI
> interface?
>
> --
> Grant Edwards grante Yow! I'm encased
> in
> the
> at lining of a pure
> pork
> visi.com sausage!!
>
>
>
Reply by ●October 10, 20072007-10-10
On 2007-10-10, Aaron Greer wrote:
> True, it is a bit larger than a 14 pin TSSOP. But it's only
> about 6mm on a side for the 40 pin QFN.
You're right. I was thinking of the 38-pin TSSOP.
> The 14-TSSOP is about 6.5 by 5.1mm, so not much smaller. The
> price is higher for the bigger part, but if you can tolerate
> that, I doubt the small increase in size would prevent you
> from using it.
The price is comparable to an ATtiny48, so that's not going to
knock it out of the running. I think the QFN part probably
would fit. Those are just so not-fun to work with. Could be
worse, could be BGA...
--
Grant Edwards grante Yow! Hey, wait
at a minute!! I want a
visi.com divorce!! ... you're not
Clint Eastwood!!
> True, it is a bit larger than a 14 pin TSSOP. But it's only
> about 6mm on a side for the 40 pin QFN.
You're right. I was thinking of the 38-pin TSSOP.
> The 14-TSSOP is about 6.5 by 5.1mm, so not much smaller. The
> price is higher for the bigger part, but if you can tolerate
> that, I doubt the small increase in size would prevent you
> from using it.
The price is comparable to an ATtiny48, so that's not going to
knock it out of the running. I think the QFN part probably
would fit. Those are just so not-fun to work with. Could be
worse, could be BGA...
--
Grant Edwards grante Yow! Hey, wait
at a minute!! I want a
visi.com divorce!! ... you're not
Clint Eastwood!!
Reply by ●October 10, 20072007-10-10
On 2007-10-10, Aaron Greer wrote:
>> It's very easy to bit-bash SPI. Particularly if you are
>> Master.
I'm not. The SPI interface would be as a slave to a device
that's runnnig a HW SPI interface at with a clock rate in the
hundreds of KHz.
>> Also TimerA is very good at a cycle-accurate UART.
I need to dedicate one 16-bit timer to a particular function.
In some projects I've used the WD/interval timer to bit-bang a
UART, but when you do that, you've only got 1 bit time to
handle a received a byte. On this project that's only going to
be a few hundred instructions, and I don't think that's going
to be enough.
>> So you could use F2011, and have both SPI & UART with S/w
>> trickery ~300bytes of code (NB This is NOT a CPU cycle timed
>> S/w-UART), but the USI on F20x2 is probably an easier reach.
> Let's keep this in the list if we can.
Please.
> I think the OP wants to have both SPI and UART at the same
> time. Using the USI won't get him that. Maybe a combo of USI
> and SW bit bash would though.
I don't think bit-banging a UART is going to be feasible. It
would have to be done on a polling basis (the function to which
the 16-bit timer is dedicated can't tolerate any interrupt
latency at all), so all foreground processing would have to be
done in increments less than one-bit-time long (chunks on the
order of 400 clock cycles). In theory, that might be possible,
but it would be pretty difficult.
--
Grant Edwards grante Yow! Kids, don't gross me
at off ... "Adventures with
visi.com MENTAL HYGIENE" can be
carried too FAR!
>> It's very easy to bit-bash SPI. Particularly if you are
>> Master.
I'm not. The SPI interface would be as a slave to a device
that's runnnig a HW SPI interface at with a clock rate in the
hundreds of KHz.
>> Also TimerA is very good at a cycle-accurate UART.
I need to dedicate one 16-bit timer to a particular function.
In some projects I've used the WD/interval timer to bit-bang a
UART, but when you do that, you've only got 1 bit time to
handle a received a byte. On this project that's only going to
be a few hundred instructions, and I don't think that's going
to be enough.
>> So you could use F2011, and have both SPI & UART with S/w
>> trickery ~300bytes of code (NB This is NOT a CPU cycle timed
>> S/w-UART), but the USI on F20x2 is probably an easier reach.
> Let's keep this in the list if we can.
Please.
> I think the OP wants to have both SPI and UART at the same
> time. Using the USI won't get him that. Maybe a combo of USI
> and SW bit bash would though.
I don't think bit-banging a UART is going to be feasible. It
would have to be done on a polling basis (the function to which
the 16-bit timer is dedicated can't tolerate any interrupt
latency at all), so all foreground processing would have to be
done in increments less than one-bit-time long (chunks on the
order of 400 clock cycles). In theory, that might be possible,
but it would be pretty difficult.
--
Grant Edwards grante Yow! Kids, don't gross me
at off ... "Adventures with
visi.com MENTAL HYGIENE" can be
carried too FAR!
Reply by ●October 10, 20072007-10-10
> Yow! Hey, wait
> a minute!! I want a
> divorce!! ... you're not
> Clint Eastwood!!
.. Marriage is a sentence, not a word :-)
Best Regards,
Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of Grant Edwards
Sent: Thursday, 11 October 2007 7:50 AM
To: m...
Subject: [msp430] Re: Small msp430 part w/ UART + SPI?
> a minute!! I want a
> divorce!! ... you're not
> Clint Eastwood!!
.. Marriage is a sentence, not a word :-)
Best Regards,
Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of Grant Edwards
Sent: Thursday, 11 October 2007 7:50 AM
To: m...
Subject: [msp430] Re: Small msp430 part w/ UART + SPI?
Reply by ●October 10, 20072007-10-10
On 2007-10-10, elruocch wrote:
> not to be unpopular, but what about using Freescale MC9S08QG8?
> It seems me to have everything: spi, uart, small size, low
> cost.
Thanks, I'll take a look at it.
> Also Renesas R8C14 is interesting, but it's a bit bigger in
> size. I normally prefer MSP430, but sometime...
An MSP430 solution would be the easiest since I've got quite a
bit of the code already running, but other architectures are
always an option.
--
Grant Edwards grante Yow! Are the STEWED PRUNES
at still in the HAIR DRYER?
visi.com
> not to be unpopular, but what about using Freescale MC9S08QG8?
> It seems me to have everything: spi, uart, small size, low
> cost.
Thanks, I'll take a look at it.
> Also Renesas R8C14 is interesting, but it's a bit bigger in
> size. I normally prefer MSP430, but sometime...
An MSP430 solution would be the easiest since I've got quite a
bit of the code already running, but other architectures are
always an option.
--
Grant Edwards grante Yow! Are the STEWED PRUNES
at still in the HAIR DRYER?
visi.com
