R8CSLASH15 datasheet(108/277 Pages) RENESAS

108 / 277 page

R8C/14 Group, R8C/15 Group

13. Timers

Rev.2.10

Jan 19, 2006

Page 96 of 253

REJ09B0164-0210

Figure 13.9

TXMR Register in Pulse Period Measurement Mode

Timer X Mode Register

Symbol

Address

After Reset

TXMR

008Bh

00h

Bit Symbol

Bit Name

Function

INT1

_____

/CNTR0 Signal

Polarity Sw itch Bit(1)

[INT1]

______

0 : Rising edge

1 : Falling edge

NOTES :

3. Refer to 20.4.2 Tim er X for precautions on the TXS bit.

This bit is set to “0” by w riting “0” in a program. (It remains unchanged even if w riting “1”)

TXUND(2)

TXEDG(2)

0 : Active edge not received

1 : Active edge received

Timer X underflow flag

0 : No underflow

1 : Underflow

The IR bit in the INT1IC register may be set to “1” (requests interrupt) w hen the R0EDG bit is rew ritten.

Refer to 20.2.5 Changing Interrupt Factor.

b3 b2

TXS

Timer X Count Start Flag(3)

b1 b0

TXMOD0

b7 b6 b5 b4

TXOCNT

TXMOD2

1 : Pulse period measurement mode

Active Edge Reception Flag

0 : Stops counting

1 : Starts counting

Set to “0” in pulse w idth measurement mode

Operating Mode Select Bit 2

Operating Mode Select Bit 0, 1

b1 b0

0 0 : Timer mode or pulse period measurement

mode

R0EDG

[CNTR0]

0 : Measures measurement pulse from one

rising edge to next rising edge

1 : Measures measurement pulse from one

falling edge to next falling edge

TXMOD1

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