Section 10 Timer A; Overview; Features - Hitachi H8/3664 Hardware Manual

Table of Contents

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 oscillator is connected. A clock signal

divided from 32.768 kHz or from the system clock can be output at the TMOW pin.

Features of timer A are given below.

• Choice of eight internal clock sources (ø/8192, ø/4096, ø/2048, ø/512, ø/256, ø/128, ø/32, ø/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 oscillator).

• An interrupt is requested when the counter overflows.

• Any of eight clock signals can be output from pin TMOW: 32.768 kHz divided by 32, 16, 8, or

4 (1 kHz, 2 kHz, 4 kHz, 8 kHz), or the system clock divided by 32, 16, 8, or 4.

Section 10 Timer A