Datasheet

V850ES/JG3 CHAPTER 19 INTERRUPT/EXCEPTION PROCESSING FUNCTION

R01UH0015EJ0300 Rev.3.00 Page 666 of 870

Sep 30, 2010

(2) External interrupt falling, rising edge specification register 3 (INTF3, INTR3)

The INTF3 and INTR3 registers are 8-bit registers that specify detection of the falling and rising edges of the

external interrupt pin (INTP7).

These registers can be read or written in 8-bit or 1-bit units.

Reset sets these registers to 00H.

Cautions 1. When the function is changed from the external interrupt function (alternate function) to the

port function, an edge may be detected. Therefore, clear the INTF31 and INTR31 bits to 00,

and then set the port mode.

2. The INTP7 pin and RXDA0 pin are alternate-function pins. When using the pin as the RXDA0

pin, disable edge detection for the INTP7 alternate-function pin (clear the INTF3.INTF31 bit

and the INRT3.INTR31 bit to 0). When using the pin as the INTP7 pin, stop UARTA0 reception

(clear the UA0CTL0.UA0RXE bit to 0).

INTF3

After reset: 00H R/W Address: INTF3 FFFFFC06H, INTR3 FFFFFC26H

0 0 0 0 0 0 INTF31 0

INTR3

0 0 0 0 0 0 INTR31 0

INTP7

Remark For how to specify a valid edge, see Table 19-4.

Table 19-4. Valid Edge Specification

INTF31 INTR31 Valid Edge Specification

0 0 No edge detected

0 1 Rising edge

1 0 Falling edge

1 1 Both rising and falling edges

Caution Be sure to clear the INTF31 and INTR31 bits to 00 when these registers are not used as INTP7

pin.