Help needed timing a pulse (2004 Robovation)

[Kevin Sevcik]

Originally Posted by yongkimleng

May I ask, is there a possibility where during the copy of the first 8 bits, the value is something like 255, and when it proceeds to copy the next 8 its, it increments by 1 (due to the overflow of the first 8 bits when the timer ticks a few more times) before it gets copied, resulting in a larger value than expected?..

That would be why you'd prefer having the timer in 16-bit read mode. In this mode, when TMRxL is read, TMRxH is instantly copied to a buffer, which can be read without fear of this problem. Writing is reversed. you write to TMRxH, which is stored to a buffer, then wrtie to TMRxL, which write that value and copies the buffer to the timer at the exact same time.