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TMRX: Four types of interrupts: Compare-match A, compare-match B, overflow, and input
capture
Figures 11.1 and 11.2 show block diagrams of 8-bit timers.
An input capture function is added to the TMRX.
External clock
TMCI0
TMCI1
Select clock
TMO0
TMRI0
Control logic
TMO1
TMRI1
[Legend]
TCORA0: Time constant register A0
TCORB0: Time constant register B0
TCNT0:
Timer counter 0
TCSR0:
Timer control/status register 0
TCR0:
Timer control register 0
Figure 11.1 Block Diagram of 8-Bit Timer (TMR0 and TMR1)
Rev. 1.00, 09/03, page 268 of 704
Internal clock
TMR0
φ/2
φ/64
φ/256
φ/8
φ/32
φ/1024
Clock 1
Clock 0
Compare match A1
Compare match A0
Overflow 1
Overflow 0
Clear 0
Compare match B1
Compare match B0
Interrupt signals
CMIA0
CMIB0
OVI0
CMIA1
CMIB1
OVI1
TMR1
φ/2
φ/128
φ/8
φ/1024
φ/64
φ/2048
TCORA0
TCORA1
Comparator A0
Comparator A1
TCNT0
TCNT1
Clear 1
Comparator B0
Comparator B1
TCORB0
TCORB1
TCSR0
TCSR1
TCR0
TCR1
TCORA1: Time constant register A1
TCORB1: Time constant register B1
TCNT1:
Timer counter 1
TCSR1:
Timer control/status register 1
TCR1:
Timer control register 1
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