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Section 9 Timers
9.1
Overview
The H8/3827R Series 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 interval timer
ø/8 to ø/8192
—
—
•
Interval function
(8 choices)
•
Time base
ø
w
/128 (choice of 4
overflow periods)
•
Clock output
ø/4 to ø/32
ø
w
, ø
w
/4 to ø
w
/32
(9 choices)
—
TMOW
Timer C
•
8-bit timer
•
Interval function
•
Event counting
function
•
Up-count/down-
count selectable
ø/4 to ø/8192, ø
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 independent8-
bit timers Output
compare output
function
ø/4 to ø/32, ø
w
/4
(4 choices)
TMIF
TMOFL
TMOFH
Timer G
•
8-bit timer
•
Input capture
function
•
Interval function
ø/2 to ø/64, ø
w
/4
(4 choices)
TMIG
—
•
Counter
clearing
option
•
Built-in
capture input
signal noise
canceler