R8CSLASH15 datasheet(83/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

11. Interrupt

Rev.2.10

Jan 19, 2006

Page 71 of 253

REJ09B0164-0210

11.2.3

INT1 Interrupt

The INT1 interrupt is generated by INT1 inputs. The edge polarity is selected by the R0EDG bit in the

TXMR register.

When the CNTRSEL bit in the UCON register is set to “0”, the INT10 pin becomes the INT1 input pin.

When the CNTRSEL bit is set to “1”, the INT11 pin becomes the INT1 input pin.

The INT10 pin is shared with the CNTR00 pin and the INT11 pin is shared with the CNTR01 pin.

Figure 11.14 shows the TXMR Register when INT1 Interrupt is Used.

Figure 11.14

TXMR Register when INT1 Interrupt is Used

Timer X Mode Register

Symbol

Address

After Reset

TXMR

008Bh

00h

Bit Symbol

Bit Name

Function

INT1

_____

/CNTR0 Polarity Sw itch

Bit(2)

P3_7/CNTR0

________

Select Bit

NOTES :

TXOCNT

Function varies depending on operating mode

TXS

Timer X Count Start Flag(3)

0 : Stops counting

1 : Starts counting

Operating Mode Select Bit 0,

1(1)

b1 b0

0 0 : Timer mode or pulse period measurement

mode

0 1 : Do not set

1 0 : Event count mode

1 1 : Pulse w idth measurement mode

b3 b2 b1 b0

b7 b6 b5 b4

TXMOD0

TXEDG

TXMOD1

R0EDG

0 : Rising edge

1 : Falling edge

Function varies depending on operating mode

Active Edge Reception Flag

TXMOD2

Operating Mode Select

Bit 2

0 : Other than pulse period measurement mode

1 : Pulse period measurement mode

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

TXUND

When using INT1

_____

interrupt, select modes other than pulse output mode.

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.

Timer X Underflow Flag

Function varies depending on operating mode

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