H8SLASH3028F datasheet(339/923 Pages) RENESAS

339 / 923 page

Rev. 2.00, 09/03, page 309 of 890

Section 9 16-Bit Timer

9.1

Overview

The H8/3028 Group has built-in 16-bit timer module with three 16-bit counter channels.

9.1.1

Features

16-bit timer features are listed below.

• Capability to process up to 6 pulse outputs or 6 pulse inputs

• Six general registers (GRs, two per channel) with independently-assignable output compare or

input capture functions

• Selection of eight counter clock sources for each channel:

Internal clocks:

φ, φ/2, φ/4, φ/8

External clocks: TCLKA, TCLKB, TCLKC, TCLKD

• Five operating modes selectable in all channels:

 Waveform output by compare match

Selection of 0 output, 1 output, or toggle output (only 0 or 1 output in channel 2)

 Input capture function

Rising edge, falling edge, or both edges (selectable)

 Counter clearing function

Counters can be cleared by compare match or input capture

 Synchronization

Two or more timer counters (16TCNTs) can be preset simultaneously, or cleared

simultaneously by compare match or input capture. Counter synchronization enables

synchronous register input and output.

 PWM mode

PWM output can be provided with an arbitrary duty cycle. With synchronization, up to

three-phase PWM output is possible

• Phase counting mode selectable in channel 2

Two-phase encoder output can be counted automatically.

• High-speed access via internal 16-bit bus

The 16TCNTs and GRs can be accessed at high speed via a 16-bit bus.

• Any initial timer output value can be set

• Nine interrupt sources

Each channel has two compare match/input capture interrupts and an overflow interrupt. All

interrupts can be requested independently.

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