H838024 datasheet(246/697 Pages) RENESAS

246 / 697 page

Section 8 I/O Ports

Rev. 7.00 Mar 10, 2005 page 204 of 652

REJ09B0042-0700

Port Pull-Up Control Register 3 (PUCR3)

Bit

Initial value

Read/Write

PUCR3

R/W

PUCR3

R/W

PUCR3

R/W

PUCR3

R/W

PUCR3

R/W

PUCR30

R/W

PUCR3

R/W

PUCR3

R/W

PUCR3 controls whether the MOS pull-up of each of the port 3 pins P37 to P30 is on or off. When

a PCR3 bit is cleared to 0, setting the corresponding PUCR3 bit to 1 turns on the MOS pull-up for

the corresponding pin, while clearing the bit to 0 turns off the MOS pull-up.

Upon reset, PUCR3 is initialized to H'00.

Port Mode Register 2 (PMR2)

Bit

—

POF1

—

WDCKS

NCS

IRQ0

Initial value

Read/Write

—

R/W

—

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 whether the PMOS transistor internal to pin P35 is

on or off. For the functions of the other bits, see the descriptions of port 1 (WDCKS and NCS) and

port 4 (IRQ0).

Bit 5—Pin P35 PMOS Transistor Control (POF1)

This bit selects whether the PMOS transistor of the output buffer for pin P35 is on or off.

Bit 5

POF1

Description

CMOS output

(initial value)

NMOS open-drain output

Note:

The pin is an NMOS open-drain output when this bit is set to 1 and P35 is an output.

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