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Rev. 2.0, 11/00, page 405 of 1037
Section 19 8-Bit PWM
19.1
Overview
The 8-bit PWM incorporates 4 channels of the duty control method. Its outputs can be used to
control a reel motor or loading motor.
19.1.1
Features
•
Conversion period: 256-state
•
Duty control method
19.1.2
Block Diagram
Figure 19.1 shows a block diagram of the 8-bit PWM (1 channel).
PWMn
(n=3 to 0)
2
0
2
7
OVF
Match signal
[Legend]
PWRn
PW8CR
: 8-bit PWM data register n
: 8-bit PWM control register
PWMn
OVF
: 8-bit PWM square-wave output pin n
: Overflow signal from FRC lower 8-bit
PWRn
Free-running counter (FRC)
Comparator
PW8CR
Polarity
specification
Internal data bus
R
S
Q
Figure 19.1 Block Diagram of 8-Bit PWM
Содержание Hitachi H8S/2191
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