Functions of Operations of Capture Functions

CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER

8.8Functions of Operations of Capture Functions

This section describes the capture function operation of the 8/16-bit capture timer/ counter.

■Capture Function Operation

●8-bit mode

To operate the capture function in the 8-bit mode, the function must be set as shown in Figure 8.8-1 .

Figure 8.8-1 Setting of Capture Function in 8-bit Mode

DDR3

TCCR

bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0

				0

CPIF	CFCLR	CPIEN	CCMSK	TCMSK	EDGS1	EDGS0	RESV
					Setting of a value
					other than 00

TCR1

TIF1

TFCR1 T1IEN

TCS12 TCS11 TCS10 TSTR1

Setting of a value other than 111

TCR0

TIF0 TFCR0 T0IEN CINV TCS02 TCS01 TCS00 TSTR0

Setting of a value other than 111

TCR2

PEN

TSEL

TCPL

Number of detected events

: Used bit

: Unused bit

: Set "0"

The 8-bit capture mode is allowed by the capture mode enable/edge detection selection bits (EDGS1 and EDGS0) of the capture control register (TCCR). "1" is written to the timer start bit (TSTR0) after the clock source selection bits (TCS02, TCS01, and TCS00) of the timer 0 control register (TCR0) have been set.

In the capture mode, the count value is captured to the capture data register (TCPL) each time a capture input edge is detected and the capture edge detection flag (CPIF) is set to "1". In this case, if the capture interrupt enable bit (CPIEN) is already set to "1", an interrupt request is output to the CPU.

The capture mode is divided into free-run mode and clear mode.

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F202RA, MB89202 specifications

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Fujitsu F202RA, MB89202 manual Functions of Operations of Capture Functions

Models: F202RA MB89202