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Peripheral Functions
Timer B
Function: Timer B is an 8-bit up/down counter that supports two operating modes, namely
free-running mode and auto-reload mode.
Features: • The timer B clock can be selected from seven internal clock frequencies or an
external clock. (It can also be taken from external event input.)
• Generates a counter overflow interrupt.
Block Diagram
System clock ø
External event
input
<Notation>
TMB:
Timer mode register B
TCB:
Timer counter B
TLB:
Timer load register B
IRRTB:
Timer B overflow interrupt request flag
Timer B Internal Clock Periods
Product Series
ø/8192 ø/4096 ø/2048 ø/1024 ø/512 ø/256 ø/128 ø/64 ø/32 ø/16 ø/8
H8/3614 Series
H8/3714 Series
B
H8/3724 Series
H8/3754 Series
H8/3814 Series
H8/3834 Series
B
H8/3877 Series
B
1
H8/3927 Series
B
2
B
3
Seven internal clock periods
Prescaler S
TMB
TCB
TLB
82
IRRTB
External
ø/4
ø/2
Event
Input
Supported
Supported
Supported
Not
supported
Not
supported
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