Renesas H8/38024 Series, Hardware Manual

Page: 282 / 661

Rev. 6.00, 08/04, page 252 of 628
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,
φ
w/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,
φ
w/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
φ
w/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.