H8SLASH3021 datasheet(188/712 Pages) RENESAS

188 / 712 page

7. I/O Ports

Rev.2.00 Mar. 22, 2007 Page 164 of 684

REJ09B0352-0200

7.9.3

Pin Functions

The port 9 pins are also used for SCI input and output (TxD, RxD, SCK), and for

IRQ

5 and IRQ4

input. Table 7.14 describes the selection of pin functions.

Table 7.14

Port 9 Pin Functions

Pin Functions and Selection Method

5/SCK1/

IRQ

Bit C/A in SMR of SCI1, bits CKE0 and CKE1 in SCR of SCI1, and bit P9

5DDR

select the pin function as follows

CKE1

—

CKE0

—

5DDR

—

Pin function

input

output

SCK

1 output

SCK

1 output

SCK

1 input

IRQ

5 input

4/SCK0/

IRQ

Bit C/A in SMR of SCI0, bits CKE0 and CKE1 in SCR of SCI, and bit P9

4DDR

select the pin function as follows

CKE1

—

CKE0

—

4DDR

—

Pin function

input

output

SCK

0 output

SCK

0 output

SCK

0 input

IRQ

4 input

3/RxD1

Bit RE in SCR of SCI1 and bit P9

3DDR select the pin function as follows

3DDR

—

Pin function

3 input

3 output

RxD1 input

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