H838024 datasheet(252/697 Pages) RENESAS

252 / 697 page

Section 8 I/O Ports

Rev. 7.00 Mar 10, 2005 page 210 of 652

REJ09B0042-0700

Port Control Register 4 (PCR4)

Bit

Initial value

Read/Write



PCR4

PCR4 is an 8-bit register for controlling whether each of port 4 pins P42 to P40 functions as an

input pin or output pin. Setting a PCR4 bit to 1 makes the corresponding pin an output pin, while

clearing the bit to 0 makes the pin an input pin. PCR4 and PDR4 settings are valid when the

corresponding pins are designated for general-purpose input/output by SCR3.

Upon reset, PCR4 is initialized to H'F8.

PCR4 is a write-only register, which is always read as all 1s.

Port Mode Register 2 (PMR2)

Bit

Initial value

Read/Write



POF1

R/W



IRQ0

R/W

WDCKS

R/W

NCS

R/W

PMR2 is an 8-bit read/write register. It controls whether the PMOS transistor internal to P35 is on

or off, the selection of the watchdog timer clock, the selection of TMIG noise cancellation, and

switching of the P43/

IRQ

0 pin functions.

Upon reset, PMR2 is initialized to H'D8.

This section only deals with the bit that controls switching of the P43/

IRQ

0 pin functions. For the

functions of the other bits, see the descriptions of port 1 (WDCKS and NCS) and port 3 (POF1).

Bit 0—P43/

IRQ

0 Pin Function Switch (IRQ0)

This bit selects whether pin P43/

IRQ

0 is used as P43 or as

IRQ

Bit 0

IRQ0

Description

Functions as P43 input pin

(initial value)

Functions as

IRQ

0 input pin

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