HD6433644R datasheet(201/549 Pages) RENESAS

201 / 549 page

Section 8 I/O Ports

Rev. 6.00 Sep 12, 2006 page 181 of 526

REJ09B0326-0600

Upon reset, PDR3 is initialized to H'00.

Port Control Register 3 (PCR3)

Bit



PCR32

PCR31

PCR30

Initial value

Read/Write



PCR3 is an 8-bit register for controlling whether each of the port 3 pins P32 to P30 functions as an

input pin or output pin. Setting a PCR3 bit to 1 makes the corresponding pin an output pin, while

clearing the bit to 0 makes the pin an input pin. The settings in PCR3 and in PDR3 are valid only

when the corresponding pin is designated in PMR3 as a general I/O pin.

Upon reset, PCR3 is initialized to H'00.

PCR3 is a write-only register, which is always read as all 1s.

Port Pull-Up Control Register 3 (PUCR3)

Bit



PUCR32 PUCR31 PUCR30

Initial value

Read/Write



R/W

Note:

* Bits 7 to 3 are reserved; they are always read as 0 and cannot be modified.

PUCR3 controls whether the MOS pull-up of each of the port 3 pins P32 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 3 (PMR3)

Bit



SO1

SI1

SCK1

Initial value

Read/Write



R/W

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