Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 92

• Manufacturer Part Number: Z8FMC04100
• Description: Z8 Encore-R Motor Control Flash MCUs
• Manufacturer: ZILOG [Zilog, Inc.]

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Z8 Encore!
Product Specification
Pulse-Width Modulator
PWM Prescaler
PWM Period and Count Resolution
®
Motor Control Flash MCUs
The prescaler allows the PWM clock signal to be decreased by factors of 1, 2, 4, or 8 with
respect to the system clock. The
(PWMCTL1) controls prescaler operation. This 2-bit
prescale value only changes upon a PWM reload event.
The PWM counter operates in two modes to allow edge-aligned outputs and center-
aligned outputs. Figures 8 and 9 illustrate edge- and center-aligned PWM outputs. The
period of the PWM outputs, PERIOD, is determined by which mode the PWM counter is
operating. The active time of a PWM output is determined by the programmed duty cycle,
PWMDC, and the programmed deadband time, PWMDB.
The sections that follow these two figures describe the PWM timer modes and the regis-
ters that control the duty cycle and deadband time.
Figure 8. Edge-Aligned PWM Output
Deadband Insertion
No Deadband
PWMxH
PWMxH
PWMxL
PWMxL
P R E L I M I N A R Y
PWMDC
PWMDB
PRES[1:0]
bit field in the PWM Control 1 Register
PRES
PWMDB
field is buffered so that the
Period
PS024604-1005