4571 datasheet(23/126 Pages) RENESAS

23 / 126 page

Rev.1.02

May 25, 2007

Page 23 of 124

REJ03B0179-0102

4571 Group

(3) External interrupt control registers

(1) Interrupt control register I1

interrupt. Set the contents of this register through register A

with the TI1A instruction. The TAI1 instruction can be used

to transfer the contents of register I1 to register A.

(2) Interrupt control register I2

interrupt. Set the contents of this register through register A

with the TI2A instruction. The TAI2 instruction can be used

to transfer the contents of register I2 to register A.

Note 1.“R” represents read enabled, and “W” represents write enabled.

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

Note 3.When the contents of I22 and I23 are changed, the external interrupt request flag EXF1 may be set.

Table 15 External interrupt control register

Interrupt control register I1

at reset : 00002

at RAM back-up : state retained

R/W

TAI1/TI1A

I13

INT0 pin input control bit (Note 2)

INT0 pin input disabled

INT0 pin input enabled

I12

Interrupt valid waveform for INT0 pin/

return level selection bit (Note 2)

Falling waveform (“L” level of INT0 pin is recognized with the SNZI0

instruction)/“L” level

Rising waveform (“H” level of INT0 pin is recognized with the SNZI0

instruction)/“H” level

I11

INT0 pin edge detection circuit control bit

One-sided edge detected

Both edges detected

I10

INT0 pin

timer 1 control enable bit

Timer 1 disabled

Timer 1 enabled

Interrupt control register I2

at reset : 00002

at RAM back-up : state retained

R/W

TAI2/TI2A

I23

INT1 pin input control bit (Note 3)

INT0 pin input disabled

INT0 pin input enabled

I22

Interrupt valid waveform for INT1 pin/

return level selection bit (Note 3)

Falling waveform (“L” level of INT0 pin is recognized with the SNZI1

instruction)/“L” level

Rising waveform (“H” level of INT0 pin is recognized with the SNZI1

instruction)/“H” level

I21

INT1 pin edge detection circuit control bit

One-sided edge detected

Both edges detected

I20

Not used

This bit has no function, but read/write is enabled.

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