MC68HC705CT4 Datasheet, PDF (97/152 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
Pulse Width Modulator (PWM)
PWM During Wait Mode
12.5 PWM During Wait Mode
The PWM continues normal operation during wait mode. To decrease
power consumption during WAIT, it is recommended that the PWME bit
in the miscellaneous control register be cleared if the PWM D/A
converter is not being used.
12.6 PWM During Stop Mode
In stop mode, the oscillator is stopped, causing the PWM to cease
function. Any signal in process is halted in whatever phase the signal
happens to be in. Disabling the PWM before executing the STOP
instruction is recommended.
12.7 PWM During Reset
Upon reset the PWME bit is cleared. In effect, this disables the PWM
system and configures the PC7/PWM pin as a high impedance port C
input pin. The user should write to the data register prior to enabling the
PWM system (for instance, prior to setting PWME). This avoids an
erroneous duty cycle from being driven.
12.8 PWM Power Supply Source
The PWM is supplied by V_DD and V_SS, due to the noise generated by the
digital circuitry, since this module is not affected by supply noise.
MC68HC705CT4 — Rev. 2.0
MOTOROLA
General Release Specification
Pulse Width Modulator (PWM)
97
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