HD6433644R datasheet(216/549 Pages) RENESAS

216 / 549 page

Section 8 I/O Ports

Rev. 6.00 Sep 12, 2006 page 196 of 526

REJ09B0326-0600

8.8.2

Table 8.20 shows the port 8 register configuration.

Table 8.20 Port 8 Registers

Name

Abbr.

R/W

Initial Value

Address

Port data register 8

PDR8

R/W

H'00

H'FFDB

Port control register 8

PCR8

H'00

H'FFEB

Port Data Register 8 (PDR8)

Bit

P87

P86

P85

P84

P83

P82

P81

P80

Initial value

Read/Write

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

PCR87

PCR86

PCR85

PCR84

PCR83

PCR82

PCR81

PCR80

Initial value

Read/Write

PCR8 is an 8-bit register for controlling whether each of 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.

Upon reset, PCR8 is initialized to H'00.

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

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