Datasheet

Section 9 Timers
Rev. 8.00 Mar. 09, 2010 Page 247 of 658
REJ09B0042-0800
Section 9 Timers
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 Internal Clock
Event
Input Pin
Waveform
Output Pin Remarks
Timer A
• 8-bit timer
— —
• Interval function
φ/8 to φ/8192
(8 choices)
• Time base
φ
w
/128 (choice of 4
overflow periods)
Timer C
• 8-bit timer
• Interval function
• Event counting function
• Up-count/down-count
selectable
φ/4 to φ/8192, φ
W
/4
(7 choices)
TMIC — Up-count/
down-count
controllable by
software or
hardware
Timer F
• 16-bit timer
• Event counting function
• Also usable as two
independent 8-bit timers
• Output compare output
function
φ/4 to φ/32, φ
w
/4
(4 choices)
TMIF TMOFL
TMOFH
Timer G
• 8-bit timer
• Input capture function
• Interval function
φ/2 to φ/64, φ
W
/4
(4 choices)
TMIG — Counter
clearing option
Built-in capture
input signal
noise canceler
Watchdog
timer
*
• Reset signal generated
when 8-bit counter
overflows
φ/8192
φ
W
/32
— — H8/38024,
H8/38024S,
H8/38024R
Group
φ/64 to φ/8192
φ
W
/32
On-chip
oscillator
H8/38124
Group