H838024 datasheet(288/697 Pages) RENESAS

288 / 697 page

Section 9 Timers

Rev. 7.00 Mar 10, 2005 page 246 of 652

REJ09B0042-0700

Name

Functions

Internal Clock

Event

Input Pin

Waveform

Output Pin

Remarks

Asynchro-

nous event

counter

•

16-bit counter

•

Also usable as two

independent 8-bit

counters

•

Counts events

asynchronous to

φ and φw

•

Can count asynchronous

events (rising/falling/both

edges) independ-ently of

the MCU's internal clock

φ/2 to φ/8

(3 choices)

AEVL

AEVH

IRQAEC

—

Note: * The watchdog timer functions differently on the H8/38024, H8/38024S, H8/38024R Group

and H8/38124 Group. See section 9.6, Watchdog Timer, for details.

9.2

Timer A

9.2.1

Overview

Timer A is an 8-bit timer with interval timing and real-time clock time-base functions. The clock

time-base function is available when a 32.768 kHz crystal resonator is connected as the subclock.

Features

Features of timer A are given below.

• Choice of eight internal clock sources (φ/8192, φ/4096, φ/2048, φ/512, φ/256, φ/128, φ/32,

φ/8).

• Choice of four overflow periods (1 s, 0.5 s, 0.25 s, 31.25 ms) when timer A is used as a clock

time base (using a 32.768 kHz crystal resonator is connected as the subclock).

• An interrupt is requested when the counter overflows.

• Use of module standby mode enables this module to be placed in standby mode independently

when not used.

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