210
9.4.5
Application Notes
The following types of contention and operation can occur when timer F is used.
1.
16-bit timer mode
In toggle output, TMOFH pin output is toggled when all 16 bits match and a compare match signal
is generated. If a TCRF write by a MOV instruction and generation of the compare match signal
occur simultaneously, TOLH data is output to the TMOFH pin as a result of the TCRF write.
TMOFL pin output is unstable in 16-bit mode, and should not be used; the TMOFL pin should be
used as a port pin.
If an OCRFL write and compare match signal generation occur simultaneously, the compare match
signal is invalid. However, if the written data and the counter value match, a compare match signal
will be generated at that point. As the compare match signal is output in synchronization with the
TCFL clock, a compare match will not result in compare match signal generation if the clock is
stopped.
Compare match flag CMFH is set when all 16 bits match and a compare match signal is generated.
Compare match flag CMFL is set if the setting conditions for the lower 8 bits are satisfied.
When TCF overflows, OVFH is set. OVFL is set if the setting conditions are satisfied when the
lower 8 bits overflow. If a TCFL write and overflow signal output occur simultaneously, the
overflow signal is not output.
2.
8-bit timer mode
a. TCFH, OCRFH
In toggle output, TMOFH pin output is toggled when a compare match occurs. If a TCRF
write by a MOV instruction and generation of the compare match signal occur
simultaneously, TOLH data is output to the TMOFH pin as a result of the TCRF write.
If an OCRFH write and compare match signal generation occur simultaneously, the
compare match signal is invalid. However, if the written data and the counter value match,
a compare match signal will be generated at that point. The compare match signal is
output in synchronization with the TCFH clock.
If a TCFH write and overflow signal output occur simultaneously, the overflow signal is
not output.
b. TCFL, OCRFL
In toggle output, TMOFL pin output is toggled when a compare match occurs. If a TCRF
write by a MOV instruction and generation of the compare match signal occur
simultaneously, TOLL data is output to the TMOFL pin as a result of the TCRF write.