HD6433644R datasheet(229/549 Pages) RENESAS

229 / 549 page

Section 9 Timers

Rev. 6.00 Sep 12, 2006 page 209 of 526

REJ09B0326-0600

9.2.4

Timer A Operation States

Table 9.4 summarizes the timer A operation states.

Table 9.4

Timer A Operation States

Operation Mode

Reset Active

Sleep

Watch

Sub-

active

Sub-

sleep

Standby

TCA Interval

Reset Functions Functions Halted

Halted

Clock time base Reset Functions Functions Functions Functions Functions Halted

TMA

Reset Functions Retained Retained Functions Retained Retained

Note: When the real-time clock time base function is selected as the internal clock of TCA in

active mode or sleep mode, the internal clock is not synchronous with the system clock, so

it is synchronized by a synchronizing circuit. This may result in a maximum error of 1/

φ (s) in

the count cycle.

9.3

Timer B1

9.3.1

Overview

Timer B1 is an 8-bit timer that increments each time a clock pulse is input. This timer has two

operation modes, interval and auto reload.

Features

Features of timer B1 are given below.

• Choice of seven internal clock sources (φ/8192, φ/2048, φ/512, φ/256, φ/64, φ/16, φ/4) or an

external clock (can be used to count external events).

• An interrupt is requested when the counter overflows.

HD6433644R Datasheet(PDF) 229 Page - Renesas Technology Corp