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Peripheral Functions
Timer A
This version of timer A is included in the H8/3614 Series, the H8/3714 Series, the H8/3724
Series, and the H8/3754 Series microcomputers.
Function: Timer A is an 8-bit interval timer that can also be used as a clock time base.
Features: • The timer A clock can be selected from eight internal clock frequencies
(ø/8192, ø/4096, ø/2048, ø/512, ø/256, ø/128, ø/32, and ø/8).
• Four overflow periods (2, 1, 0.5, and 0.125 seconds when used at 32.768 kHz)
available when used as a clock time base.
• Generates a counter overflow interrupt.
Block Diagram
ø
(32 kHz)
W
System clock ø
<Notation>
TMA:
Timer mode register A
TCA:
Timer counter A
IRRTA:
Timer A overflow interrupt request flag
Notes: 1.
* These can only be selected when the prescaler W output (ø
clock.
2.
This figure shows the Timer A circuit used in the H8/3724.
ø
/8
W
1/8
Prescaler W
ø
Prescaler S
/256
W
ø/8192, ø/4096,
ø/2048, ø/512, ø/256,
ø/128, ø/32, ø/8
80
TMA
TCA
/256) is used as the TCA input
W
IRRTA
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