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Hitachi H8/300L Series Manual page 87

Single-chip microcomputer
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Timer F
Function: Timer F is a 16-bit timer that, in addition to supporting external event counting,
also supports functions such as counter reset in response to a compare match
signal, interrupt requests, and toggle output. It can also function as two
independent 8-bit timers.
Features: • The timer F clock can be selected from four internal clock frequencies (ø/32,
ø/16, ø/4, and ø/2) and an external clock.
• The counter can be reset from a single compare match signal.
• Interrupts: One compare match interrupt and one overflow interrupt.
• Can be used as two independent 8-bit timers, timer FL and timer FH.
Block Diagram
System
clock ø
External
event input
Toggle
TMOFL
circuit
Toggle
TMOFH
circuit
<Notation>
TCRF:
Timer control register F
TCSRF:
Timer control status register F
TCFH:
8-bit timer counter FH
TCFL:
8-bit timer counter FL
OCRFH:
Output compare register FH
OCRFL:
Output compare register FL
IRRTFH:
Timer FH interrupt request flag
IRRTFL:
Timer FL interrupt request flag
Prescaler S
TCRF
TCFL
Comparator
OCRFL
TCFH
Comparator
OCRFH
TCSRF
87
Peripheral Functions
IRRTFL
Match
IRRTFH

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