H838024 datasheet(268/697 Pages) RENESAS

268 / 697 page

Section 8 I/O Ports

Rev. 7.00 Mar 10, 2005 page 226 of 652

REJ09B0042-0700

Port Data Register 8 (PDR8)

Bit

Initial value

Read/Write

P87

R/W

P86

R/W

P85

R/W

P84

R/W

P83

R/W

P82

R/W

P81

R/W

PDR8 is an 8-bit register that stores data for port 8 pins P87 to P80. If port 8 is read while PCR8

bits are set to 1, the values stored in PDR8 are read, regardless of the actual pin states. If port 8 is

read while PCR8 bits are cleared to 0, the pin states are read.

Upon reset, PDR8 is initialized to H'00.

Port Control Register 8 (PCR8)

Bit

Initial value

Read/Write

PCR87

PCR86

PCR85

PCR84

PCR83

PCR80

PCR82

PCR81

PCR8 is an 8-bit register for controlling whether the port 8 pins P87 to P80 functions as an input or

output pin. Setting a PCR8 bit to 1 makes the corresponding pin an output pin, while clearing the

bit to 0 makes the pin an input pin. PCR8 and PDR8 settings are valid when the corresponding

pins are designated for general-purpose input/output by bits SGS3 to SGS0 in LPCR.

Upon reset, PCR8 is initialized to H'00.

PCR8 is a write-only register, which is always read as all 1s.

H838024 Datasheet(PDF) 268 Page - Renesas Technology Corp

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