H838024 datasheet(303/697 Pages) RENESAS

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Section 9 Timers

Rev. 7.00 Mar 10, 2005 page 261 of 652

REJ09B0042-0700

9.4

Timer F

9.4.1

Overview

Timer F is a 16-bit timer with a built-in output compare function. As well as counting external

events, timer F also provides for counter resetting, interrupt request generation, toggle output, etc.,

using compare match signals. Timer F can also be used as two independent 8-bit timers (timer FH

and timer FL).

Features

Features of timer F are given below.

• Choice of four internal clock sources (φ/32, φ/16, φ/4, φw/4) or an external clock (can be used

as an external event counter)

• TMOFH/TMOFL pin toggle output provided using a single compare match signal (toggle

output initial value can be set)

• Counter resetting by a compare match signal

• Two interrupt sources: one compare match, one overflow

• Can operate as two independent 8-bit timers (timer FH and timer FL) (in 8-bit mode).

Timer FH 8-Bit Timer*

Timer FL

8-Bit Timer/Event Counter

Internal clock

Choice of 4 (

φ/32, φ/16, φ/4, φw/4)

Event input

—

TMIF pin

Toggle output

One compare match signal, output to

TMOFH pin(initial value settable)

One compare match signal, output to

TMOFL pin (initial value settable)

Counter reset

Counter can be reset by compare match signal

Interrupt sources

One compare match

One overflow

Note: * When timer F operates as a 16-bit timer, it operates on the timer FL overflow signal.

• Operation in watch mode, subactive mode, and subsleep mode

When

φw/4 is selected as the internal clock, timer F can operate in watch mode, subactive

mode, and subsleep mode.

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

when not used.

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