MC68HC708MP16 Datasheet, PDF (208/398 Pages) Freescale Semiconductor, Inc – Microcontrollers

Timer Interface Module A (TIMA)
OVERFLOW
OVERFLOW
PERIOD
OVERFLOW
PTEx/TCHxA
PULSE
WIDTH
OUTPUT
COMPARE
OUTPUT
COMPARE
Figure 11-3. PWM Period and Pulse Width
OUTPUT
COMPARE
The value in the TIMA counter modulo registers and the selected
prescaler output determines the frequency of the PWM output. The
frequency of an 8-bit PWM signal is variable in 256 increments. Writing
$00FF (255) to the TIMA counter modulo registers produces a PWM
period of 256 times the internal bus clock period if the prescaler select
value is 000 (see 11.9.1 TIMA Status and Control Register).
The value in the TIMA channel registers determines the pulse width of
the PWM output. The pulse width of an 8-bit PWM signal is variable in
256 increments. Writing $0080 (128) to the TIMA channel registers
produces a duty cycle of 128/256 or 50%.
Technical Data
208
Timer Interface Module A (TIMA)
MC68HC708MP16 — Rev. 3.1
Freescale Semiconductor