Datasheet

Section 9 8-Bit PWM Timers
Rev. 4.00 Sep 27, 2006 page 279 of 1130
REJ09B0327-0400
Section 9 8-Bit PWM Timers
Provided in the H8S/2148 Group; not provided in the H8S/2144 Group and H8S/2147N.
9.1 Overview
The H8/2148 Group has an on-chip pulse width modulation (PWM) timer module with sixteen
outputs. Sixteen output waveforms are generated from a common time base, enabling PWM
output with a high carrier frequency to be produced using pulse division. The PWM timer module
has sixteen 8-bit PWM data registers (PWDRs), and an output pulse with a duty cycle of 0 to
100% can be obtained as specified by PWDR and the port data register (P1DR or P2DR).
9.1.1 Features
The PWM timer module has the following 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