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CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER
8.4.1 Capture Control Register (TCCR)
The capture control register (TCCR) is used to select functions and detection edges,
control interrupts, and check interrupt states in timer 0 for the 8-bit mode of the 8/16 bit
capture timer/counter or in capture mode (16-bit mode).
■ Capture Control Register (TCCR)
Figure 8.4-2 Capture Control Register (TCCR)
RESV
0
EDGS1 EDGS0
00
01
1
0
1
1
TCMSK
0
1
CCMSK
0
1
CPIEN
0
1
CFCLR
0
1
CPIF
0
1
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
CPIF CFCLR CPIEN CCMSK TCMSK
EDGS1 EDGS0
RESV
R R/W R/W R/W R/W R/W R/W R/W
R/W : Readable/Writable
R : Read only
: Initial value
1
Address
Initial value
Capture input selection bit
Operation is not affected at all.
Capture mode enable/edge detection selection bit
Capture input prohibition
Operation in timer/counter mode
Falling edge selection
Rising edge selection
Selection of both falling
and rising edges
Operation in capture mode
Compare match counter clear mask bit
The counter is cleared per compare match.
The counter is not cleared at compare match.
Counter clear mask bit (at capture operation)
The counter is cleared when a capture edge is detected.
The counter is not cleared when a capture edge is detected.
Capture interrupt request enable bit
Capture interrupt request output is prohibited.
Capture interrupt request output is allowed.
Capture edge detection flag clear bit
Not affected (at read, always "0")
The capture edge detection flag is cleared.
Capture edge detection flag bit
No capture edge was detected.
A capture edge was detected.
0019
H
00000000
B