H8S2245 datasheet(274/818 Pages) RENESAS

274 / 818 page

Section 8 I/O Ports

Rev.3.00 Mar. 26, 2007 Page 232 of 772

REJ09B0355-0300

8.4.3

Pin Functions

Port 3 pins also function as SCI I/O pins (TxD0, RxD0, SCK0, TxD1, RxD1, and SCK1) and

interrupt input pins (

IRQ4, IRQ5). Port 3 pin functions are shown in table 8.7.

Table 8.7

Port 3 Pin Functions

Selection Method and Pin Functions

5/SCK1/IRQ5

The pin function is switched as shown below according to the combination of

bit C/

A in the SCI1 SMR, bits CKE0 and CKE1 in SCR, and bit P35DDR.

CKE1

—

CKE0

——

P35DDR

——

—

Pin function

input pin

output pin*

SCK1

output pin*

SCK1

output pin*

SCK1

input pin

IRQ5 interrupt input pin*2

Notes: 1. When P35ODR = 1, the pin becomes on NMOS open-drain output.

2. When this pin is used as an external interrupt input, it should not be

used as an input/output pin with other functions.

4/SCK0/IRQ4

The pin function is switched as shown below according to the combination of

bit C/

A in the SCI0 SMR, bits CKE0 and CKE1 in SCR, and bit P34DDR.

CKE1

—

CKE0

——

P34DDR

——

—

Pin function

input pin

output pin*

SCK0

output pin*

SCK0

output pin*

SCK0

input pin

IRQ4 interrupt input pin*2

Notes: 1. When P34ODR = 1, the pin becomes an NMOS open-drain output.

2. When this pin is used as an external interrupt input, it should not be

used as an input/output pin with other functions.

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