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Section 10 16-Bit Free-Running Timer (FRT)
Figure 10.1 is a block diagram of the FRT.
Clock selector
[Legend]
OCRA, OCRB:
OCRAR,OCRAF:
FRC:
TCSR:
TIER:
TCR:
TOCR:
Figure 10.1 Block Diagram of 16-Bit Free-Running Timer
Rev. 1.00 Mar. 12, 2008 Page 374 of 1178
REJ09B0403-0100
Internal clock
φ/2
φ/8
φ/32
Clock
Compare-match A
Overflow
Clear
Compare-match B
Control logic
OCIA
OCIB
FOVI
Output compare registers A and B (16 bits)
Output compare registers AR and AF (16 bits)
Free-running counter (16 bits)
Timer control/status register (8 bits)
Timer interrupt enable register (8 bits)
Timer control register (8 bits)
Timer output compare control register (8 bits)
OCRAR/F
OCRA
Comparator A
FRC
Comparator B
OCRB
TCSR
TIER
TCR
TOCR
Interrupt signal
Internal data bus
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