mc68hc908lb8 Freescale Semiconductor, Inc, mc68hc908lb8 Datasheet - Page 200

• Manufacturer Part Number: mc68hc908lb8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Timer Interface Module (TIM)
TOVx — Toggle On Overflow Bit
CHxMAX — Channel x Maximum Duty Cycle Bit
200
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.
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 TIM counter overflow.
0 = Channel x pin does not toggle on TIM counter overflow.
MSxB:MSxA
When TOVx is set, a TIM counter overflow takes precedence over a
channel x output compare if both occur at the same time.
CHxMAX
TCHx
X0
X1
1X
1X
1X
00
00
00
01
01
01
OVERFLOW
Table 18-2. Mode, Edge, and Level Selection
ELSxB:ELSxA
Figure 18-12
COMPARE
PERIOD
OUTPUT
00
00
01
10
11
01
10
11
01
10
11
Figure 18-12. CHxMAX Latency
OVERFLOW
MC68HC908LB8 Data Sheet, Rev. 1
shows, the CHxMAX bit takes effect in the cycle after it is set
COMPARE
OUTPUT
or buffered PWM
Output compare
Buffered output
Output preset
Input capture
NOTE
compare
or PWM
Mode
OVERFLOW
COMPARE
OUTPUT
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
OVERFLOW
Configuration
COMPARE
OUTPUT
OVERFLOW
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