Re: Microcontroller with 4x16 Bit Timers

From: Paul Carpenter (paul$_at_pcserv.demon.co.uk)
Date: 06/24/04 

Date: Thu, 24 Jun 2004 19:46:51 +0000 (UTC)

On 24 Jun, in article
     <40227952.0406240347.b233e43@posting.google.com>
     sjones@scannex.co.uk "Stephen Jones" wrote:

>I am looking for small low cost processor ideally with 4 16 bit

That depends on what you mean by small and low cost :)

>capture on interrupt timers. Its to measure the minimum bit width of 4
>RS232 sources, which can have a minimum bit width of 8.2uS. This has
>to be done continuously with the results filtered etc with resulting
>bit width converted to its corresponding baud rate and then an
>equivalent 4 bit number which is output to a IO port. Therefore the
>processor requires 20 I/O lines.

When doing this sort of thing I use the H8/H8S from Renesas, I used one
with 5 X 16 bits timers to use four to control a linescan CCD and the fifth
to detect rising and falling edges on a signal coming back. I then used
two further 8 bit timers for task scheduling and interupt ready for LCD
delays. See circuit cellar Renesas comeptition on their website.

Most of the timers have rising edge and falling edge as SEPARATE registers
and separate interupts on each timer to enable fast capture of events.

They are plenty of evaluation boards available for this sort of thing.

>Any ideas etc would be appreciated

HTH 

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