Reply by Albert van der Horst●February 17, 20082008-02-17
In article <cb8bec52-9f3f-48e8-8a0d-eaeaf526d7db@i29g2000prf.googlegroups.com>,
werty <werty@swissinfo.org> wrote:
>
>Apparently you have no meaningful purpose for this hardware .
>
> You post ........ $1.44 .... Whats the total cost in h/w and your
>time ?!!.
>
> I always write about important and productive uses for electronics .
>
>The is no faster nor easier way to inmplement a powerful mcu , that
>with A.R.M.
>
> The slowest and most frustrating is MicroChip mcu's , next comes
>Intel 8051
>
> with its "simulated" control of external memory !
>
> The STR710FZ2 has no bottlenecks nor extra chips needed .
>
> no one wants to EVB , so ill use an avail' LPC2292 ,144 pins , but
>way less internal SRAM ,
>
> external 1/2 MB SRAM and 2MB Flash ...
>
> As soon as i stop travelling so much , ill give away a free Forth
>O.S. for the ARM .
>
Don't hold your breath, people. werty is best known for his
trolling, i.a. on comp.lang.forth.
Groetjes Albert
--
--
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- like all pyramid schemes -- ultimately falters.
albert@spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst
Reply by werty●February 17, 20082008-02-17
Apparently you have no meaningful purpose for this hardware .
You post ........ $1.44 .... Whats the total cost in h/w and your
time ?!!.
I always write about important and productive uses for electronics .
The is no faster nor easier way to inmplement a powerful mcu , that
with A.R.M.
The slowest and most frustrating is MicroChip mcu's , next comes
Intel 8051
with its "simulated" control of external memory !
The STR710FZ2 has no bottlenecks nor extra chips needed .
no one wants to EVB , so ill use an avail' LPC2292 ,144 pins , but
way less internal SRAM ,
external 1/2 MB SRAM and 2MB Flash ...
As soon as i stop travelling so much , ill give away a free Forth
O.S. for the ARM .
On Feb 13, 11:08=A0pm, Neil <NeilKu...@worldnet.att.net> wrote:
> werty wrote:
> > =A0You will learn that MicroChip is obsolete .
>
> > =A0Use A.R.M. , its modern , lower cost for
> > =A0the same job .
>
> A 14 pin A.R.M. with RAM Flash and internal oscillator for $1.44 USD?
> (list for the PIC16F684)
>
> What is the part number?
>
> A PIC16F54 is under 50 cents
> Sometimes little jobs only need little CPUs.
Reply by rickman●February 15, 20082008-02-15
On Feb 14, 3:14 am, Jim Granville <no.s...@designtools.maps.co.nz>
wrote:
> werty wrote:
> > You will learn that MicroChip is obsolete.
>
> Microchip is a company, not a device.
> As a company, they supply a great number of cores,
> under the umbrella branding of PIC.
>
>
>
> > Use A.R.M. , its modern , lower cost for
> > the same job .
>
> There is a whole world out there : A great many applications
> are chosen on the P's : Pincount, Power, Peripherals, Price.
>
> Notice the core is not even on this list!
>
> ARMs 'bottom out' at ~48 pins,
> so that leaves 6/8/10/14/16/18/20/24/28/32/36/40/44 pins, all
> as candidates for other cores - indeed the ARM cannot reach these
> applications at all.
>
> (Microchips PIC32 cores do not bother going below 64 pins)
I suppose you missed the introduction of the Luminary Micro ARM parts
a year or two ago???
Reply by Jim Granville●February 14, 20082008-02-14
werty wrote:
> You will learn that MicroChip is obsolete.
Microchip is a company, not a device.
As a company, they supply a great number of cores,
under the umbrella branding of PIC.
>
> Use A.R.M. , its modern , lower cost for
> the same job .
There is a whole world out there : A great many applications
are chosen on the P's : Pincount, Power, Peripherals, Price.
Notice the core is not even on this list!
ARMs 'bottom out' at ~48 pins,
so that leaves 6/8/10/14/16/18/20/24/28/32/36/40/44 pins, all
as candidates for other cores - indeed the ARM cannot reach these
applications at all.
(Microchips PIC32 cores do not bother going below 64 pins)
-jg
Reply by Arlet Ottens●February 14, 20082008-02-14
Neil wrote:
> werty wrote:
>> You will learn that MicroChip is obsolete .
>>
>> Use A.R.M. , its modern , lower cost for
>> the same job .
> A 14 pin A.R.M. with RAM Flash and internal oscillator for $1.44 USD?
> (list for the PIC16F684)
>
> What is the part number?
>
> A PIC16F54 is under 50 cents
> Sometimes little jobs only need little CPUs.
No, ARMs are not *that* cheap or small.
They're getting close, though, and they may be a good alternative for
the bigger PIC devices.
http://www.luminarymicro.com/products/lm3s101_microcontroller.html
ARM Cortex, 28 pins, internal oscillator, 2K RAM, for $2.18 (single qty
@ Digi-Key)
Reply by Neil●February 14, 20082008-02-14
werty wrote:
> You will learn that MicroChip is obsolete .
>
> Use A.R.M. , its modern , lower cost for
> the same job .
A 14 pin A.R.M. with RAM Flash and internal oscillator for $1.44 USD?
(list for the PIC16F684)
What is the part number?
A PIC16F54 is under 50 cents
Sometimes little jobs only need little CPUs.
Reply by werty●February 14, 20082008-02-14
You will learn that MicroChip is obsolete .
Use A.R.M. , its modern , lower cost for
the same job .
Reply by Tim Wescott●February 11, 20082008-02-11
Joerg wrote:
> Tom�s � h�ilidhe wrote:
>>
>> I'm very new to working with microcontrollers, I only started
>> using them properly within the last week.
>>
>> I'm using the PIC16F684 in conjunction with MPLAB and PIC C.
>>
>> One of my pins on the PIC chip is connected to the output from an
>> encoder. The output from the encoder will always be either 5 V or 0 V,
>> it will never be high impedence.
>>
>> When power is applied to my circuit and the microcontroller boots
>> up, I need to make sure that the pins are all high impedence, because
>> if any of them are high or low then I'll have a short circuit leading
>> to the encoder.
>>
>> Does anyone know how to ensure that all the pins on the 16F684
>> will be high impedence initially?
>>
>> My pin layout for the PIC16F684 is:
>>
>> C0 thru C5: Output to LED's
>>
>> A0: Output to LED
>>
>> A1 thru A3: Input from Encoder
>>
>> A4: Output to the clock input of a shift register
>>
>> A5: Output to a Piezo speaker
>>
>>
>> Basically I want to use all 12 pins, I don't want them to be set
>> to anything like A/D convertors or clock inputs. Does anyone know what
>> __CONFIG parameters I need to achieve this?
>>
>> Basically I want either:
>> 1) All pins are high impedence at the start, and then my code in main
>> sets them as per my specifications above.
>> 2) All pins are set the way I want them when the chip boots up by
>> using __CONFIG parameters (I don't even know if this is possible).
>>
>> Also, does anyone know how long it takes for the PIC16F684 to boot
>> up and actually start executing instructions? I've been told that it
>> executes its first instruction about 20 milliseconds after power is
>> applied; does this sound about right? Also does anyone know how long
>> it takes for the pin voltage to change once the machine instruction
>> has been executed?
>>
>
> I don't know PICs but how about providing a resistor between encoder
> output and PIC? Just in case some piece of code goes wrong and it
> assigns that pin as output.
>
Yea verily. Or at least if you have the board space to do it. If you
_don't_ have the board space to do it then carefully assess the amount
of damage you'll do by having an output <---> output failure, and put a
commensurate amount of effort into verifying your software.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html
Reply by Tim Wescott●February 11, 20082008-02-11
Arlet Ottens wrote:
> Tom�s � h�ilidhe wrote:
>>
>> I'm very new to working with microcontrollers, I only started
>> using them properly within the last week.
>>
>> I'm using the PIC16F684 in conjunction with MPLAB and PIC C.
>>
>> One of my pins on the PIC chip is connected to the output from an
>> encoder. The output from the encoder will always be either 5 V or 0 V,
>> it will never be high impedence.
>>
>> When power is applied to my circuit and the microcontroller boots
>> up, I need to make sure that the pins are all high impedence, because
>> if any of them are high or low then I'll have a short circuit leading
>> to the encoder.
>>
>> Does anyone know how to ensure that all the pins on the 16F684
>> will be high impedence initially?
>
> After reset, all I/O pins are set to inputs. The datasheet shows that
> after a reset, the TRIS bits are set to '1'. So, there won't be a conflict.
This is normal for most microcontrollers these days, at least for pins
that can be either input or output. You should _always_ check the data
sheet carefully, though. Data sheets never modify themselves* to your
disadvantage after your design is set in stone, although this sometimes
seems to be the case.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html
>
> I'm very new to working with microcontrollers, I only started using
> them properly within the last week.
>
> I'm using the PIC16F684 in conjunction with MPLAB and PIC C.
>
> One of my pins on the PIC chip is connected to the output from an
> encoder. The output from the encoder will always be either 5 V or 0 V, it
> will never be high impedence.
>
> When power is applied to my circuit and the microcontroller boots up, I
> need to make sure that the pins are all high impedence, because if any of
> them are high or low then I'll have a short circuit leading to the encoder.
>
> Does anyone know how to ensure that all the pins on the 16F684 will be
> high impedence initially?
After reset, all I/O pins are set to inputs. The datasheet shows that
after a reset, the TRIS bits are set to '1'. So, there won't be a conflict.