If you are using the timer to wake from sleep, and you say its clock is external, then it will work, but you have to set the "ClockSync" parameter of the timer to Unsynchronised, and the digital interconnect on the row the clock comes in, has to be set to Async.
If they are not,then the input clock would be synchronious to, for example the system clock, which is not running, therefore no clock for you timer.
Thanks for the reply.
I have my Timer unsynchronized and the digital row input is set to asyncrhronous. Still I cannot get my clock to interrupt on the falling edge and wake up from sleep mode.
I am using an 8bit timer to count the first six pulses after a reset pulse is seen. Then I change that timer settings to interrupt on capture, invertcapture, and the input to be the same as the clock for timer 1, and the timer clock to 32KHz...
So at this point I should beable to wake up on each falling edge. I have an LED to toggle when I enter the interrupt routine, but I do not see this happen. Maybe there is something still that I am missing.
I would suggest trying to get the code working without using sleep first, to ensure that your logic and implementation are correct.
Yes, that is all fine, the code while awake works, its only when I put it to sleep. I have abandoned the idea that I will be able to wake up on this incoming falling edge... I have decided to just use the I/O interrupt instead of a clock to do this... Thanks for the effort though.