h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 181

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

This LSI has an on-chip pulse width modulation (PWM) timer with eight outputs. Eight output
waveforms are generated from a common time base, enabling PWM output with a high carrier
frequency to be produced using pulse division. Connecting a low pass filter externally to the LSI
enables the PWM to function as an 8-bit D/A converter.
8.1
• Operable at a maximum carrier frequency of 625 kHz using pulse division (at 10 MHz
• 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.
PWM0800B_000120040200
operation)
[Legend]
PWSL:
PWDR:
PWDPRA:
PWOERA:
PCSR:
P1DDR:
Note: * The program development tool (emulator) does not support this function.
P10/PW0
P11/PW1
P12/PW2
P13/PW3
P14/PW4
P15/PW5
P16/PW6
P17/PW7
Features
PWM register select
PWM data register
PWM data polarity register A
PWM output enable register A
Peripheral clock select register
Port 1 data direction register
PWDPRA
PWOERA
P1DDR
Section 8 8-Bit PWM Timer (PWM)
Figure 8.1 Block Diagram of PWM Timer
Comparator 0
Comparator 1
Comparator 2
Comparator 3
Comparator 4
Comparator 5
Comparator 6
Comparator 7
counter
Clock
φ
φ/2
Internal clock
φ/4
PWDR0
PWDR1
PWDR2
PWDR3
PWDR4
PWDR5
PWDR6
PWDR7
Select
φ/8
clock
φ/16
φ/256*
φ/512*
φ/1024*
Rev. 1.00, 05/04, page 147 of 544
φ/4096*
Module
data bus
PWSL
PCSR
Internal
data bus