mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 216

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Pulse Width Modulator (PWM)
13.6 Low-Power Modes
13.7 Wait Mode
13.8 Stop Mode
Data Sheet
216
The PH[0:6] value is used once to determine the start-up time of the
different PWM counters. After that, all PWM counters become free
running counters and the phase between the counters will remain
unchanged. Changing the value of PH[0:6] after all PWM counters are
running has no effect. The counters must first be disabled by clearing the
PWM enable bits, PWMEN[0:2], to logic 0, before a new phase value is
effective.
Automatic phase control is only available with two (PWM2–PWM1) or
three (PWM2–PWM0) PWM channels.
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
The PWM module remains active after the execution of a WAIT
instruction. In wait mode, the PWM registers are not accessible by the
CPU.
If PWM functions are not required during wait mode, reduce power
consumption by disabling the PWM before executing the WAIT
instruction.
The PWM is inactive after the execution of a STOP instruction. The
STOP instruction does not affect register conditions or the state of the
PWM counters and outputs. PWM operation resumes when the MCU
exits stop mode after an external interrupt.
Pulse Width Modulator (PWM)
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor