H838024R datasheet(238/697 Pages) RENESAS

238 / 697 page

Section 8 I/O Ports

Rev. 7.00 Mar 10, 2005 page 196 of 652

REJ09B0042-0700

Port Data Register 1 (PDR1)

Bit

P17

P16*

—P14

P13

——

—

Initial value

—

Read/Write

R/W

—

R/W

—

PDR1 is an 8-bit register that stores data for port 1 pins P17, P16*, P14, and P13. 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.

Note: * Pin 16 and the associated function are not implemented on the H8/38124 Group.

The register is both readable and writeable.

Port Control Register 1 (PCR1)

Bit

PCR17

PCR16*

—

PCR14

PCR13

——

—

Initial value

—

Read/Write

PCR1 is an 8-bit register for controlling whether each of the port 1 pins P17, P16*, P14, and P13

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.

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

Note: * Pin 16 and the associated function are not implemented on the H8/38124 Group.

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