HD6432351 datasheet(390/1025 Pages) RENESAS

390 / 1025 page

Section 9 I/O Ports

Rev. 3.00 Sep 15, 2006 page 356 of 988

REJ09B0330-0300

9.5

Port 4

9.5.1

Overview

Port 4 is an 8-bit input-only port. Port 4 pins also function as A/D converter analog input pins

(AN0 to AN7) and D/A converter analog output pins (DA0 and DA1). Port 4 pin functions are the

same in all operating modes. Figure 9.4 shows the port 4 pin configuration.

P47

P46

P45

P44

P43

P42

P41

P40

(input)/

AN7 (input)/DA1 (output)

AN6 (input)/DA0 (output)

AN5 (input)

AN4 (input)

AN3 (input)

AN2 (input)

AN1 (input)

AN0 (input)

Port 4 pins

Port 4

Figure 9.4 Port 4 Pin Functions

9.5.2

Table 9.8 shows the port 4 register configuration. Port 4 is an input-only port, and does not have a

data direction register or data register.

Table 9.8

Port 4 Registers

Name

Abbreviation

R/W

Initial Value

Address*

Port 4 register

PORT4

Undefined

H'FF53

Note:

* Lower 16 bits of the address.

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