参数资料
型号: MC68331CFC25B1
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 25 MHz, MICROCONTROLLER, PQFP132
封装: 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, QFP-132
文件页数: 72/90页
文件大小: 481K
代理商: MC68331CFC25B1
MOTOROLA
MC68331
74
MC68331TS/D
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.
16/32 PWM BLOCK BLOCK
ZERO DETECTOR
16-BIT COUNTER
PWMA REGISTER
PWMB REGISTER
PWMABUF REGISTER
PWMBBUF REGISTER
"A" COMPARATOR
"B" COMPARATOR
"A" MULTIPLEXER
"B" MULTIPLEXER
SFB
BIT
SFA
BIT
F1A
BIT
F1B
BIT
LATCH
R
S
LATCH
R
S
ZERO DETECTOR
PWMB
PIN
PWMA
PIN
FROM
PRESCALER CLOCK
[14:0]
16-BIT DATA BUS
8-BIT
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