Datasheet

Timer Interface Module (TIM)
MC68HC908JL3E Family Data Sheet, Rev. 4
94 Freescale Semiconductor
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 TIM 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 TIM counter overflow.
0 = Channel x pin does not toggle on TIM counter overflow.
NOTE
When TOVx is set, a TIM 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 one, setting the CHxMAX bit forces the duty cycle of buffered and unbuffered
PWM signals to 100%. As Figure 8-8 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.
Figure 8-8. CHxMAX Latency
OUTPUT
OVERFLOW
TCHx
PERIOD
CHxMAX
OVERFLOW OVERFLOW OVERFLOW OVERFLOW
COMPARE
OUTPUT
COMPARE
OUTPUT
COMPARE
OUTPUT
COMPARE