H8SSLASH2225 datasheet(407/1071 Pages) RENESAS

部件名	H8S/2225

功能描述	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	1071 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

标志

407 / 1071 page

Section 10 I/O Ports

Rev. 5.00 Aug 08, 2006 page 321 of 982

REJ09B0054-0500

• P30/TxD0

The pin functions are switched as shown below according to the combination of the TE bit in

SCR_0 of SCI_0 and the P30DDR bit.

P30DDR



Pin functions

P30 input pin

P30 output pin*

TxD0 output*

Note:

* When P30ODR is set to 1, it functions as NMOS open drain output.

10.3

Port 4

Port 4 is an 8-bit input port and has the following register.

• Port 4 register (PORT4)

10.3.1

Port 4 Register (PORT4)

PORT4 shows port 4 pin states.

Bit

Bit Name

Initial Value

R/W

Description

7P47

—*

6P46

—*

5P45

—*

4P44

—*

3P43

—*

2P42

—*

1P41

—*

0P40

—*

The pin states are always read when a port 4 read

is performed.

Note:

* Determined by the states of pins P47 to P40.

10.3.2

Pin Functions

Port 4 pins also function as A/D converter analog input pins (AN7 to AN0).

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