s908qc16vdse Freescale Semiconductor, Inc, s908qc16vdse Datasheet - Page 203

• Manufacturer Part Number: s908qc16vdse
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

TOVx — Toggle-On-Overflow Bit
CHxMAX — Channel x Maximum Duty Cycle Bit
Freescale Semiconductor
When ELSxB and ELSxA are both clear, channel x is not connected to an I/O port, and pin T1CHx is
available as a general-purpose I/O pin.
When channel x is an output compare channel, this read/write bit controls the behavior of the channel
x output when the counter overflows. When channel x is an input capture channel, TOVx has no effect.
When the TOVx bit is at 1, setting the CHxMAX bit forces the duty cycle of buffered and unbuffered
PWM signals to 100%. As
or cleared. The output stays at the 100% duty cycle level until the cycle after CHxMAX is cleared.
1 = Channel x pin toggles on counter overflow.
0 = Channel x pin does not toggle on counter overflow.
After initially enabling a TIM1 channel register for input capture operation
and selecting the edge sensitivity, clear CHxF to ignore any erroneous
edge detection flags.
When TOVx is set, a counter overflow takes precedence over a channel x
output compare if both occur at the same time.
CHxMAX
T1CHx
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 4
OVERFLOW
Figure 16-13
COMPARE
PERIOD
OUTPUT
Figure 16-13. CHxMAX Latency
OVERFLOW
Table 16-2
shows, the CHxMAX bit takes effect in the cycle after it is set
COMPARE
OUTPUT
NOTE
NOTE
OVERFLOW
shows how ELSxB and ELSxA work.
COMPARE
OUTPUT
OVERFLOW
COMPARE
OUTPUT
OVERFLOW
Registers
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