MC68331CEH16 Datasheet, PDF (74/84 Pages) Freescale Semiconductor, Inc – 32-Bit Modular Microcontroller

Freescale Semiconductor, Inc.
16-BIT DATA BUS
PWMA REGISTER
PWMB REGISTER
PWMABUF REGISTER PWMBBUF REGISTER
PWMA
PIN
F1A
BIT
R
LATCH
S
ZERO DETECTOR
"A" COMPARATOR
"B" COMPARATOR
R
LATCH
S
ZERO DETECTOR
PWMB
PIN
F1B
BIT
SFA
BIT
"A" MULTIPLEXER
"B" MULTIPLEXER
SFB
BIT
16-BIT COUNTER [14:0]
FROM
PRESCALER CLOCK
16/32 PWM BLOCK BLOCK
Figure 18 PWM Unit Block Diagram
6.3 Pulse-Width Modulator
The pulse-width modulation submodule has two output pins. The outputs are periodic waveforms con-
trolled by a single frequency whose duty cycles can be independently selected and modified by user
software. Each PWM can be independently programmed to run in fast or slow mode. The PWM unit has
its own 16-bit free-running counter, which is clocked by an output of the nine-stage prescaler (the same
prescaler used by the capture/compare unit) or by the clock input pin, PCLK.
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MC68331TS/D
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