ColdFire/68K Microcontrollers and ProcessorsのトピックRe: 5282 timer(GPT).

5282 timer(GPT).

rao — Thu, 27 Apr 2006 12:19:16 GMT

Is it possible to use the external clocking source for GPT(General purpose timers).

No where they mentioned this thing in the reference manual.

If it is possible can any one guide me.And if possible send a code snippet which covers this issue.

thanks in advance.

Regards,

Rao.

Re: 5282 timer(GPT).

airswit — Thu, 27 Apr 2006 13:30:08 GMT

though i have not tried to use it, and am not too sure i am understanding it correctly, i believe that the pulse accumulator is what you are looking for. this can be used, least on the 5213, by using the input pin for GPT3, in which case you can count the pulses on this pin. think this is what you are looking for

Re: 5282 timer(GPT).

rao — Thu, 27 Apr 2006 15:28:46 GMT

hai,

Thanks for your responce.

But That's not what i am looking for exactly.

Actually i am looking for reducing the system clock frequency so that i can increase the time diference between two Consecutive TICKS.

Please give some guidence.

Actually i am looking for reducing the resolution(increasing minimum timeout), so that i can get more time out for overflow.

if you are not clear let me know.

Re: 5282 timer(GPT).

mnorman — Fri, 28 Apr 2006 05:16:38 GMT

Yes, you can use an external clock. Referring to Figure 20-1 in the MCF5282RM: a clock can be input on the GPTn3 pin as the pulse accumulator (PA) input. With the PAE bit set and PAMOD cleared, the input clock can then be the GPT counter input clock. The CLK[1:0] settings will determine if it is the PACLK, PACLK / 256 or PACLK / 65536.

Re: 5282 timer(GPT).

rao — Fri, 28 Apr 2006 10:08:51 GMT

Thank you.