Sign in
Search lpc2000
Subscribe to lpc2000
lpc2000 by Keywords
2106 | ADC | ARM7 | Atmel | Bootloader | CAN | CrossStudio | CrossWorks | DDS | ECos | Ethernet | ETM | FIFO | FLASH | FPGA | GCC | GDB | GNU | GNUARM | GPIO | I2C | IAP | IAR | JTAG | Kickstart | LCD | Linux | LPC | LPC-E2294 | LPC2000 | LPC2100 | LPC2104 | Lpc2106 | Lpc210x | LPC2114 | LPC2119 | LPC2124 | LPC2129 | Lpc2138 | LPC213x | LPC21xx | LPC2210 | LPC2212 | LPC2214 | LPC2292 | LPC2294 | LPC2xxx | LPC3128 | MCB2100 | Olimex | Philips | PWM | Rowley | RTC | RTOS | SPI | SSP | UART | UART0 | UART1 | ULINK | USB | Watchdog | Wiggler
Ads
Discussion Groups
Discussion Groups | LPC2000 | RE: port switching settling time - LPC2148
Discussion group dedicated to the Philips LPC2000 family of ARM MCUs
port switching settling time - LPC2148 - Sutton Mehaffey - Aug 28 11:05:41 2008
I am using ports to emulate a data bus. So, these 8 bits are both
inputs and outputs. What is the settling time when switching from one
to the other to be sure they are ready to be read from or written to?
I can't find that time in the datasheet. It seems to work with no
real delay, but I wanted to be sure. If it is NS, then I probably
don't need any delay. If it is US, then I probably need something.
Sutton
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
inputs and outputs. What is the settling time when switching from one
to the other to be sure they are ready to be read from or written to?
I can't find that time in the datasheet. It seems to work with no
real delay, but I wanted to be sure. If it is NS, then I probably
don't need any delay. If it is US, then I probably need something.
Sutton
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
RE: port switching settling time - LPC2148 - Paul Claessen - Aug 28 13:33:24 2008
I just measured this on a 2378, with fast GPIO's (not sure the 2140 has
those too) and running at 48Mhz, and I measured a GPIO latency of about 40
nsec.
~ Paul Claessen
From: l...@yahoogroups.com [mailto:l...@yahoogroups.com] On Behalf Of
Sutton Mehaffey
Sent: Thursday, August 28, 2008 11:06 AM
To: l...@yahoogroups.com
Subject: [lpc2000] port switching settling time - LPC2148
I am using ports to emulate a data bus. So, these 8 bits are both
inputs and outputs. What is the settling time when switching from one
to the other to be sure they are ready to be read from or written to?
I can't find that time in the datasheet. It seems to work with no
real delay, but I wanted to be sure. If it is NS, then I probably
don't need any delay. If it is US, then I probably need something.
Sutton
[Non-text portions of this message have been removed]
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
those too) and running at 48Mhz, and I measured a GPIO latency of about 40
nsec.
~ Paul Claessen
From: l...@yahoogroups.com [mailto:l...@yahoogroups.com] On Behalf Of
Sutton Mehaffey
Sent: Thursday, August 28, 2008 11:06 AM
To: l...@yahoogroups.com
Subject: [lpc2000] port switching settling time - LPC2148
I am using ports to emulate a data bus. So, these 8 bits are both
inputs and outputs. What is the settling time when switching from one
to the other to be sure they are ready to be read from or written to?
I can't find that time in the datasheet. It seems to work with no
real delay, but I wanted to be sure. If it is NS, then I probably
don't need any delay. If it is US, then I probably need something.
Sutton
[Non-text portions of this message have been removed]
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
Re: port switching settling time - LPC2148 - Sutton Mehaffey - Aug 28 13:47:55 2008
Thanks. I'm not using fast GPIOs, but am waiting an extra usec. That
seems to work fine.
--- In l...@yahoogroups.com, "Paul Claessen" wrote:
>
> I just measured this on a 2378, with fast GPIO's (not sure the 2140 has
> those too) and running at 48Mhz, and I measured a GPIO latency of
about 40
> nsec.
>
> ~ Paul Claessen
>
> From: l...@yahoogroups.com [mailto:l...@yahoogroups.com] On
Behalf Of
> Sutton Mehaffey
> Sent: Thursday, August 28, 2008 11:06 AM
> To: l...@yahoogroups.com
> Subject: [lpc2000] port switching settling time - LPC2148
>
> I am using ports to emulate a data bus. So, these 8 bits are both
> inputs and outputs. What is the settling time when switching from one
> to the other to be sure they are ready to be read from or written to?
> I can't find that time in the datasheet. It seems to work with no
> real delay, but I wanted to be sure. If it is NS, then I probably
> don't need any delay. If it is US, then I probably need something.
>
> Sutton
>
> [Non-text portions of this message have been removed]
>
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
seems to work fine.
--- In l...@yahoogroups.com, "Paul Claessen"
>
> I just measured this on a 2378, with fast GPIO's (not sure the 2140 has
> those too) and running at 48Mhz, and I measured a GPIO latency of
about 40
> nsec.
>
> ~ Paul Claessen
>
> From: l...@yahoogroups.com [mailto:l...@yahoogroups.com] On
Behalf Of
> Sutton Mehaffey
> Sent: Thursday, August 28, 2008 11:06 AM
> To: l...@yahoogroups.com
> Subject: [lpc2000] port switching settling time - LPC2148
>
> I am using ports to emulate a data bus. So, these 8 bits are both
> inputs and outputs. What is the settling time when switching from one
> to the other to be sure they are ready to be read from or written to?
> I can't find that time in the datasheet. It seems to work with no
> real delay, but I wanted to be sure. If it is NS, then I probably
> don't need any delay. If it is US, then I probably need something.
>
> Sutton
>
> [Non-text portions of this message have been removed]
>
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )