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10.1.2
Block Diagram
The 8-bit timers are divided into two groups of two channels each: group 0 comprising channels 0
and 1, and group 1 comprising channels 2 and 3. Figure 10.1 shows a block diagram of 8-bit timer
group 0.
External clock
sources
TCLKA
TCLKC
TMO
0
TMIO
1
Legend
TCORA : Timer constant register A
TCORB : Timer constant register B
TCNT
TCSR
TCR
Figure 10.1 Block Diagram of 8-Bit Timer Unit (Two Channels: Group 0)
Internal clock
sources
φ/8
φ/64
φ/8192
Clock 1
Clock 0
Clock select
Compare match A1
Compare match A0
Overflow 1
Overflow 0
Compare match B1
Control logic
Compare match B0
Input capture B1
CMIA0
CMIB0
CMIA1/CMIB1
OVI0/OVI1
Interrupt signals
: Timer counter
: Timer control/status register
: Timer control register
TCORA0
TCORA1
Comparator A0
Comparator A1
TCNT0
TCNT1
Comparator B0
Comparator B1
TCORB0
TCORB1
TCSR0
TCSR1
TCR0
TCR1
Rev. 4.00 Jan 26, 2006 page 399 of 938
Section 10 8-Bit Timers
REJ09B0276-0400
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