HD6433644R datasheet(192/549 Pages) RENESAS

192 / 549 page

Section 8 I/O Ports

Rev. 6.00 Sep 12, 2006 page 172 of 526

REJ09B0326-0600

PDR1 is an 8-bit register that stores data for port 1 pins P17 through P14 and P10. If port 1 is read

while PCR1 bits are set to 1, the values stored in PDR1 are read, regardless of the actual pin states.

If port 1 is read while PCR1 bits are cleared to 0, the pin states are read.

Upon reset, PDR1 is initialized to H'00.

Port Control Register 1 (PCR1)

Bit

PCR17

PCR16

PCR15

PCR14



PCR10

Initial value

Read/Write



PCR1 is an 8-bit register for controlling whether each of the port 1 pins P17 through P14 and P10

functions as an input pin or output pin. Setting a PCR1 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 PCR1 and in

PDR1 are valid only when the corresponding pin is designated in PMR1 as a general I/O pin.

Upon reset, PCR1 is initialized to H'00.

PCR1 is a write-only register, which is always read as all 1s.

Port Pull-Up Control Register 1 (PUCR1)

Bit

PUCR17 PUCR16 PUCR15 PUCR14



PUCR10

Initial value

Read/Write

R/W



R/W

Note:

* Bits 3 to 1 are reserved; they are always read as 0 and cannot be modified.

PUCR1 controls whether the MOS pull-up of each of the port 1 pins P17 through P14 and P10 is on

or off. When a PCR1 bit is cleared to 0, setting the corresponding PUCR1 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, PUCR1 is initialized to H'00.

HD6433644R Datasheet(PDF) 192 Page - Renesas Technology Corp