7906 datasheet(98/531 Pages) RENESAS

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7906 Group User’s Manual Rev.2.0

INTERRUPTS

6-19

6.10 External interrupts

Fig. 6.10.1 Structure of port P2 pin function control register

Fig. 6.10.2 Structure of external interrupt input read register

Port P2 pin function control register (Address AE16)

6 to 4

Bit name

Bit

Function

At reset

R/W

Pin TB0IN select bit

Pin TB1IN select bit

Pin TB2IN select bit

Pin INT3/RTPTRG0 select bit

(Note)

Nothing is assigned.

Fix this bit to “0.”

b7 b6 b5 b4 b3 b2 b1 b0

0 : Allocate pin TB2IN to P57.

1 : Allocate pin TB2IN to P26.

0: Allocate pin INT3/RTPTRG0 to P74.

1: Allocate pin INT3/RTPTRG0 to P27.

0 : Allocate pin TB0IN to P55.

1 : Allocate pin TB0IN to P24.

0 : Allocate pin TB1IN to P56.

1 : Allocate pin TB1IN to P25.

Undefined

—

Note: When allocating pin INT3/RTPTRG0 to P74, be sure the D-A1 output enable bit (bit 1 at address 9616) = “0” (output disabled).

2 to 0

Bit name

Bit

Function

At reset

R/W

External interrupt input read register (Address 9516)

The value is undefined at reading.

INT3 read out bit

INT4 read out bit

INT5 read out bit

INT6 read out bit

INT7 read out bit

Undefined

b7 b6 b5 b4 b3 b2 b1 b0

The input level at the corresponding pin is read out.

0 : “L” level

1 : “H” level

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