4559 Datasheet, PDF(60/148 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4559 Datasheet, PDF (60/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4559 Group

Table 27 Interrupt control register

Interrupt control register I1

at reset : 00002

at power down : state retained

R/W

TAI1/TI1A

I13 INT pin input control bit (Note 2)

0 INT pin input disabled

1 INT pin input enabled

I12

Interrupt valid waveform for INT pin/

return level selection bit (Note 2)

0

Falling waveform (âLâ level of INT pin is recognized with the SNZI0

instruction)/âLâ level

1

Rising waveform (âHâ level of INT pin is recognized with the SNZI0

instruction)/âHâ level

I11 INT pin edge detection circuit control bit

0 One-sided edge detected

1 Both edges detected

I10

INT pin timer 1 count start synchronous

circuit selection bit

0 Timer 1 count start synchronous circuit not selected

1 Timer 1 count start synchronous circuit selected

Note 1. âRâ represents read enabled, and âWâ represents write enabled.

Note 2. When the contents of I12 and I13 are changed, the external interrupt request flag EXF0 may be set.

Rev.1.04 Aug 23, 2007 Page 60 of 146

REJ03B0188-0104

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