HD6433937 Datasheet, PDF (191/521 Pages) Hitachi Semiconductor – Hardware Manual

Section 9 Timers
9.1 Overview
The H8/3937 Series and H8/3937R Series provide five timers: timers A, C, F, G, and a watchdog
timer. The functions of these timers are outlined in table 9-1.
Table 9-1 Timer Functions
Name
Functions
Internal Clock
Event Waveform
Input Pin 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)
Timer C
• Clock output
ø/4 to ø/32 ø_W, ø_W/4 —
to ø_W/32 (9 choices)
• 8-bit timer
• Interval function
ø/4 to ø/8192, ø_W/4 TMIC
(7 choices)
• Event counting function
• Up-count/down-count
selectable
TMOW
—
Up- count/
down-count
controllable by
software or
hardware
Timer F
• 16-bit timer
ø/4 to ø/32, ø_W/4
• Event counting function ^{(4 choices)}
• Also usable as two
independent 8-bit timers
• Output compare output
function
TMIF
TMOFL
TMOFH
Timer G • 8-bit timer
ø/2 to ø/64, ø_W/4 TMIG —
• Input capture function ^{(4 choices)}
• Interval function
Counter
clearing option
Built-in capture
input signal
noise canceler
Watchdog • Reset signal generated ø/8192
timer
when 8-bit counter
øw/32
overflows
—
—
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