MC68HC708MP16 Datasheet, PDF (222/398 Pages) Freescale Semiconductor, Inc – Microcontrollers

Timer Interface Module A (TIMA)
NOTE: Before enabling a TIMA channel register for input capture operation,
make sure that the PTEx/TACHx pin is stable for at least two bus clocks.
TOVx — Toggle-On-Overflow Bit
When channel x is an output compare channel, this read/write bit
controls the behavior of the channel x output when the TIMA counter
overflows. When channel x is an input capture channel, TOVx has no
effect. Reset clears the TOVx bit.
1 = Channel x pin toggles on TIMA counter overflow.
0 = Channel x pin does not toggle on TIMA counter overflow.
NOTE: When TOVx is set, a TIMA counter overflow takes precedence over a
channel x output compare if both occur at the same time.
CHxMAX — Channel x Maximum Duty Cycle Bit
When the TOVx bit is at logic 0, setting the CHxMAX bit forces the
duty cycle of buffered and unbuffered PWM signals to 100%. As
Figure 11-8 shows, the CHxMAX bit takes effect in the cycle after it
is set or cleared. The output stays at the 100% duty cycle level until
the cycle after CHxMAX is cleared.
OVERFLOW
OVERFLOW
PERIOD
PTEx/TACHx
OVERFLOW
OVERFLOW
OVERFLOW
CHxMAX
OUTPUT
COMPARE
OUTPUT
COMPARE
OUTPUT
COMPARE
OUTPUT
COMPARE
Figure 11-8. CHxMAX Latency
Technical Data
222
Timer Interface Module A (TIMA)
MC68HC708MP16 — Rev. 3.1
Freescale Semiconductor