Fujitsu F202RA, MB89202 manual Capture Control Register Tccr

CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER

8.4.1Capture 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)

Address

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

Initial value

0019H

CPIF

CFCLR CPIEN CCMSK TCMSK EDGS1 EDGS0

RESV

00000000B

R

R/W

R/W

R/W

R/W

R/W

R/W

R/W

RESV

Capture input selection bit

0

Operation is not affected at all.

1

EDGS1 EDGS0

Capture mode enable/edge detection selection bit

Capture input prohibition Operation in timer/counter mode

0

0

0

1

Falling edge selection

1

0

Rising edge selection

Operation in capture mode

1Selection of both falling

1and rising edges

TCMSK Compare match counter clear mask bit

0The counter is cleared per compare match.

1The counter is not cleared at compare match.

CCMSK Counter clear mask bit (at capture operation)

0The counter is cleared when a capture edge is detected.

1The counter is not cleared when a capture edge is detected.

CPIEN Capture interrupt request enable bit

0Capture interrupt request output is prohibited.

1Capture interrupt request output is allowed.

CFCLR Capture edge detection flag clear bit

0Not affected (at read, always "0")

1The capture edge detection flag is cleared.

CPIF Capture edge detection flag bit

0No capture edge was detected.

1A capture edge was detected.

R/W : Readable/Writable R : Read only

: Initial value

171