s908ab32ag0cfue Freescale Semiconductor, Inc, s908ab32ag0cfue Datasheet - Page 191

• Manufacturer Part Number: s908ab32ag0cfue
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908AB32
Freescale Semiconductor
NOTE:
NOTE:
—
Rev. 1.1
Before enabling a TIMA channel register for input capture operation,
make sure that the TACHx pin is stable for at least two bus clocks.
TOVx — Toggle-On-Overflow Bit
When TOVx is set, a TIMA counter overflow takes precedence over a
channel x output compare if both occur at the same time.
CHxMAX — Channel x Maximum Duty Cycle Bit
MSxB
When channel x is an output compare channel, this read/write bit
controls the behavior of the channel x output when the TIMA counter
overflows. When channel x is an input capture channel, TOVx has no
effect. Reset clears the TOVx bit.
When the TOVx bit is at logic zero, setting the CHxMAX bit forces the
duty cycle of buffered and unbuffered PWM signals to 100%. As
Figure 11-13
is set or cleared. The output stays at the 100% duty cycle level until
the cycle after CHxMAX is cleared.
X
X
0
0
0
0
0
0
1
1
1
1 = Channel x pin toggles on TIMA counter overflow.
0 = Channel x pin does not toggle on TIMA counter overflow.
MSxA
Timer Interface Module A (TIMA)
0
1
0
0
0
1
1
1
X
X
X
Table 11-3. Mode, Edge, and Level Selection
shows, the CHxMAX bit takes effect in the cycle after it
ELSxB
0
0
0
1
1
0
1
1
0
1
1
ELSxA
0
0
1
0
1
1
0
1
1
0
1
Compare or
Compare
Capture
or PWM
Buffered
Buffered
Output
Output
Mode
Preset
Output
Input
PWM
Pin under Port Control;
Initial Output Level High
Pin under Port Control;
Initial Output Level Low
Capture on Rising Edge Only
Capture on Falling Edge Only
Capture on Rising or Falling Edge
Toggle Output on Compare
Clear Output on Compare
Set Output on Compare
Toggle Output on Compare
Clear Output on Compare
Set Output on Compare
Timer Interface Module A (TIMA)
Configuration
Technical Data
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