PWM0800A_000020020300
Rev. 1.00, 09/03, page 217 of 704
Section 8 8-Bit PWM Timer (PWM)
This LSI has an on-chip pulse width modulation (PWM) timer with eight outputs. Eight output
waveforms are generated from a common timebase, enabling PWM output with a high carrier
frequency to be produced using pulse division.
8.1 Features
•
Operable at a maximum carrier frequency of 1.25 MHz using pulse division (at 20-MHz
operation)
•
Duty cycles from 0 to 100% with 1/256 resolution (100% duty realized by port output)
•
Direct or inverted PWM output, and PWM output enable/disable control
Figure 8.1 shows a block diagram of the PWM timer.
P10/PW0
P11/PW1
P12/PW2
P13/PW3
P14/PW4
P15/PW5
P16/PW6
P17/PW7
Comparator 0
Comparator 1
Comparator 2
Comparator 3
Comparator 4
Comparator 5
Comparator 6
Comparator 7
PWDR0
PWDR1
PWDR2
PWDR3
PWDR4
PWDR5
PWDR6
PWDR7
PWSL
φ
φ
/8
PTCNT0
PWDPR
PWOER
P1DDR
P1DR
[Legend]
PWSL:
PWDR:
PWDPR:
PWOER:
PCSR:
P1DDR:
P1DR:
PTCNT0:
PWM register select
PWM data register
PWM data polarity register
PWM output enable register
Peripheral clock select register
Port 1 data direction register
Port 1 data register
Port control register 0
PCSR
φ
/2
φ
/4
φ
/16
P
o
rt/PWM output control
Module
data bus
Internal
data bus
Bus interf
ace
Select
clock
Clock
counter
Internal clock
Figure 8.1 Block Diagram of PWM Timer
Содержание H8S/2437
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