HD6433713 datasheet(149/324 Pages) RENESAS

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8.2 Timer A

8.2.1 Overview

Timer A is an 8-bit interval timer. It can be connected to a 32.768 kHz crystal oscillator for use as

a real-time clock time base.

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 (2 s, 1 s, 0.5 s, 125 ms) when timer A is used as a time

base (using a 32.768 kHz crystal oscillator).

•

An interrupt is requested when the counter overflows.

Block diagram

Figure 8-2 shows a block diagram of timer A.

Figure 8-2 Block Diagram of Timer A

1/8

Prescaler W

(PSW)

Prescaler S

(PSS)

TMA

TCA

SUB/32

SUB

φ/8192, /4096, /2048

/512, /256, /128,

/32, /8

φφ

IRRTA

32 kHz

crystal

oscillator

Notation:

TMA:

TCA:

IRRTA:

Timer mode register A

Timer counter A

Timer A overflow interrupt request flag (interrupt request register 2)

* Can be selected only when the input clock to

TCA is the output from prescaler W (

/32).

SUB

Note:

Interval

timer

overflow

1/2

System

clock

138

HD6433713 Datasheet(PDF) 149 Page - Renesas Technology Corp

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