9. Timers
Rev.3.00 Jul. 19, 2007 page 210 of 532
REJ09B0397-0300
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 oscillator is connected. A clock signal
divided from 32.768 kHz or from the system clock can be output at the TMOW pin.
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 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.
Summary of Contents for F-ZTAT H8 Series
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