HD6433644R datasheet(197/549 Pages) RENESAS

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Section 8 I/O Ports

Rev. 6.00 Sep 12, 2006 page 177 of 526

REJ09B0326-0600

8.3

Port 2

8.3.1

Overview

Port 2 is a 3-bit I/O port, configured as shown in figure 8.2.

P2 /TXD

P2 /RXD

P2 /SCK

Port 2

Figure 8.2 Port 2 Pin Configuration

8.3.2

Table 8.5 shows the port 2 register configuration.

Table 8.5

Port 2 Registers

Name

Abbr.

R/W

Initial Value

Address

Port data register 2

PDR2

R/W

H'00

H'FFD5

Port control register 2

PCR2

H'00

H'FFE5

Port Data Register 2 (PDR2)

Bit



P22

P21

P20

Initial value

Read/Write



R/W

Note:

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

PDR2 is an 8-bit register that stores data for port 2 pins P22 to P20. If port 2 is read while PCR2

bits are set to 1, the values stored in PDR2 are read, regardless of the actual pin states. If port 2 is

read while PCR2 bits are cleared to 0, the pin states are read.

Upon reset, PDR2 is initialized to H'00.

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