R8CSLASH2G datasheet(226/344 Pages) RENESAS

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R8C/2G Group

17. Timers

Rev.1.00

Apr 04, 2008

Page 206 of 318

REJ09B0387-0100

Figure 17.52

Operating Example in Input Capture Mode

FFFFh

0000h

Count starts

Overflow

Time

TSTART bit in

TRFCR0 register

Measured pulse

(TRFI pin input)

The above applies under the following conditions.

Bits TRFC04 to TRFC03 in TRFCR0 register = 01b (Capture input polarity is set for falling edge.)

TRFC20 bit in TRFCR2 register = 0 (TRFI pin input)

← Measurement value 2

Measurement

value 3

Set to 1 by a program

Measured

value 1

TRFM0 register

Measured value 2

Measured

value 3

IR bit in

TRFIC register

IR bit in

CAPIC register

Set to 0 when interrupt request is acknowledged, or set by a program.

When the count

stops, the value

is set to 0000h.

Set to 0 by

a program

Undefined

Measurement value 2 -

measurement value 1

(10000h - measurement value 2) +

measurement value 3

Set to 0 when interrupt request is

acknowledged, or set by a program.

The delay caused by digital filter and

one count source cycle delay (max.).

←

← Measurement value 1

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