Timer F; Overview - Renesas H8/3847R Series Hardware Manual

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).
1. 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 pin (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).
Internal clock
Event input
Toggle output
Counter reset
Interrupt sources
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.
Timer FH 8-Bit Timer*
Choice of 4 (φ/32, φ/16, φ/4, φw/4)
—
One compare match signal,
output to TMOFH pin
(initial value settable)
Counter can be reset by compare match signal
One compare match
One overflow
Timer FL 8-Bit Timer/Event Counter
TMIF pin
One compare match signal,
output to TMOFL pin
(initial value settable)
Rev. 6.00 Aug 04, 2006 page 275 of 680
Section 9 Timers
REJ09B0145-0600