Section 9 Timers; Overview - Renesas H8 Series Hardware Manual

9.1

Overview

This LSI provides six timers: timers A, C, F, G, and a watchdog timer, and an asynchronous event
counter. The functions of these timers are outlined in table 9.1.
Table 9.1 Timer Functions
Name Functions
•
Timer A 8-bit timer
•
Interval function
•
Time base
•
Timer C 8-bit timer
•
Interval function
•
Event counting function
•
Up-count/down-count
selectable
•
Timer F
16-bit timer
•
Event counting function
•
Also usable as two
independent 8-bit timers
•
Output compare output
function
•
Timer G
8-bit timer
•
Input capture function
•
Interval function
•
Watchdog
Reset signal generated
timer *
when 8-bit counter
overflows

Section 9 Timers

Internal Clock
φ/8 to φ/8192
(8 choices)
φ w /128 (choice of 4
overflow periods)
φ/4 to φ/8192, φ
/4
W
(7 choices)
φ/4 to φ/32, φ w /4
(4 choices)
φ/2 to φ/64, φ
/4
W
(4 choices)
φ/8192
φ
/32
W
φ/64 to φ/8192
φ
/32
W
oscillator
On-chip
Event Waveform
Input Pin Output Pin
— —
TMIC —
TMIF TMOFL
TMOFH
TMIG —
— —
Rev. 7.00 Mar 10, 2005 page 245 of 652
Section 9 Timers
Remarks
Up-count/
down-count
controllable by
software or
hardware
Counter
clearing option
Built-in capture
input signal
noise canceler
H8/38024,
H8/38024S,
H8/38024R
Group
H8/38124
Group
REJ09B0042-0700