Datasheet

Timer Interface Module (TIM)
Technical Data MC68HC908GR8 — Rev 4.0
358 Timer Interface Module (TIM) MOTOROLA
NOTE: Before enabling a TIM channel register for input capture operation, make
sure that the PTD/TCHx 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 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.
Table 22-3. Mode, Edge, and Level Selection
MSxB:MSxA ELSxB:ELSxA Mode Configuration
X0 00
Output preset
Pin under port control;
initial output level high
X1 00
Pin under port control;
initial output level low
00 01
Input capture
Capture on rising edge only
00 10 Capture on falling edge only
00 11
Capture on rising or
falling edge
01 01
Output
compare or
PWM
Toggle output on compare
01 10 Clear output on compare
01 11 Set output on compare
1X 01
Buffered
output
compare or
buffered PWM
Toggle output on compare
1X 10 Clear output on compare
1X 11 Set output on compare
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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