MC68HC08XL36 Datasheet, PDF (189/362 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Timer Interface Module (TIM)
I/O Registers
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.
NOTE: Reading the high byte of the timer channel x registers (TCHxH) prevents
the channel x pin from toggling until the low byte (TCHxL) is read.
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 12 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
TCHx
OVERFLOW
OVERFLOW
OVERFLOW
CHxMAX
OUTPUT
COMPARE
OUTPUT
COMPARE
OUTPUT
COMPARE
OUTPUT
COMPARE
Figure 12. CHxMAX Latency
27-tim4_b
MOTOROLA
Timer Interface Module (TIM)
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MC68HC08XL36
189