Freescale Semiconductor MC68HC908MR16 Datasheet page 249

MSxB:MSxA ELSxB:ELSxA
X0
X1
00
00
00
01
01
01
01
1X
1X
1X
When TOVx is set, a TIMB counter overflow takes precedence over a
channel x output compare if both occur at the same time.
CHxMAX — Channel x Maximum Duty Cycle Bit
When the TOVx is 1 and clear output on compare is selected, setting the CHxMAX bit forces the duty
cycle of buffered and unbuffered PWM signals to 100 percent. As
takes effect in the cycle after it is set or cleared. The output stays at 100 percent duty cycle level until
the cycle after CHxMAX is cleared.
OVERFLOW
PTEx/TCHx
CHxMAX
TOVx
Freescale Semiconductor
Table 17-2. Mode, Edge, and Level Selection
Mode
00
Output preset
00
01
10 Input capture
11
00
01
Output compare
or PWM
10
11
01 Buffered output
compare
10
or buffered
11
PWM
OVERFLOW
PERIOD
OUTPUT
COMPARE
Figure 17-9. CHxMAX Latency
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
Pin under port control; initialize timer output level high
Pin under port control; initialize timer output level low
Capture on rising edge only
Capture on falling edge only
Capture on rising or falling edge
Softare compare only
Toggle output on compare
Clear output on compare
Set output on compare
Toggle output on compare
Clear output on compare
Set output on compare
NOTE
OVERFLOW OVERFLOW
OUTPUT OUTPUT
COMPARE COMPARE
Configuration
Figure 17-9 shows, CHxMAX bit
OVERFLOW
OUTPUT
COMPARE
I/O Registers
249