Timer Interface Module B (TIMB)
Technical Data
MC68HC08AZ32A — Rev 1.0
280
Timer Interface Module B (TIMB)
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MOTOROLA
NOTE:
Before enabling a TIMB channel register for input capture operation,
make sure that the PTFx/TBCHx 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 TIMB 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 TIMB counter overflow.
0 = Channel x pin does not toggle on TIMB counter overflow.
NOTE:
When TOVx is set, a TIMB counter overflow takes precedence over a
channel x output compare if both occur at the same time.
Table 17-2. Mode, Edge, and Level Selection
MSxB:MSxA
ELSxB:ELSxA
Mode
Configuration
X0
00
Output
Preset
Pin under Port Control;
Initialize Timer
Output Level High
X1
00
Pin under Port Control;
Initialize Timer
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
F
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