mc68hc908qf4 Freescale Semiconductor, Inc, mc68hc908qf4 Datasheet - Page 152

• Manufacturer Part Number: mc68hc908qf4
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Timer Interface Module (TIM)
Data Sheet
152
NOTE:
NOTE:
ELSxB and ELSxA — Edge/Level Select Bits
After initially enabling a TIM channel register for input capture operation and
selecting the edge sensitivity, clear CHxF to ignore any erroneous edge detection
flags.
TOVx — Toggle-On-Overflow Bit
When TOVx is set, a TIM 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 channel x is an input capture channel, these read/write bits control the
active edge-sensing logic on channel x.
When channel x is an output compare channel, ELSxB and ELSxA control the
channel x output behavior when an output compare occurs.
When ELSxB and ELSxA are both clear, channel x is not connected to an I/O
port, and pin TCHx is available as a general-purpose I/O pin.
how ELSxB and ELSxA work. Reset clears the ELSxB and ELSxA bits.
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 a 1, setting the CHxMAX bit forces the duty cycle of
buffered and unbuffered PWM signals to 100%. As
CHxMAX bit takes effect in the cycle after it is set or cleared. The output stays
at the 100% duty cycle level until the cycle after CHxMAX is cleared.
CHxMAX
TCHx
1 = Channel x pin toggles on TIM counter overflow.
0 = Channel x pin does not toggle on TIM counter overflow.
Freescale Semiconductor, Inc.
For More Information On This Product,
OVERFLOW
Go to: www.freescale.com
Timer Interface Module (TIM)
COMPARE
PERIOD
OUTPUT
OVERFLOW
Figure 15-9. CHxMAX Latency
COMPARE
OUTPUT
OVERFLOW
COMPARE
OUTPUT
OVERFLOW
Figure 15-9
MC68HC908QF4 — Rev. 1.0
COMPARE
OUTPUT
Table 15-3
OVERFLOW
shows, the
MOTOROLA
shows