287
9.1.2
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 9.1 shows a block diagram of 8-bit timer
group 0.
φ
/8
φ
/64
φ
/8192
CMIA0
CMIB0
CMIA1/CMIB1
OVI0/OVI1
Interrupt signals
TMO
0
TMIO
1
TCORA0
TCORB0
8TCSR0
8TCR0
TCORA1
8TCNT1
TCORB1
8TCSR1
8TCR1
TCLKA
TCLKC
8TCNT0
Legend:
TCORA : Time constant register A
TCORB : Time constant register B
8TCNT : Timer counter
8TCSR : Timer control/status register
8TCR
: Timer control register
External clock
sources
Internal clock
sources
Clock select
Control logic
Clock 1
Clock 0
Compare match A1
Compare match A0
Overflow 1
Overflow 0
Compare match B1
Compare match B0
Input capture B1
Comparator A0
Comparator A1
Comparator B0
Comparator B1
Internal bus
Figure 9.1 Block Diagram of 8-Bit Timer Unit (Two Channels: Group 0)
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