HD64F2149YV datasheet(268/1075 Pages) RENESAS

268 / 1075 page

Section 8 I/O Ports

Rev. 3.00 Jan 18, 2006 page 240 of 1044

REJ09B0280-0300

8.9.3

Pin Functions

Port 8 pins also function as SCI1 I/O pins (TxD1, RxD1, SCK1), the IIC1 I/O pin (SCL1), host

interface (HIF) I/O pins (

CS2, GA20, HA0, HIFSD), host interface (LPC) I/O pins (PME, GA20,

CLKRUN, LPCPD), and interrupt input pins (IRQ5 to IRQ3). The port 8 pin functions are shown

in table 8.17.

Table 8.17

Port 8 Pin Functions

Selection Method and Pin Functions

P86/

IRQ5/SCK1/

SCL1

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

bits CKE1 and CKE0 in SCR of SCI1, bit C/

A in SMR of SCI1, bit ICE in ICCR

of IIC1, and bit P86DDR.

ICE

CKE1

—

CKE0

——

P86DDR

———

—

Pin function

P86

input pin

P86

output pin

SCK1

output pin

SCK1

output pin

SCK1

input pin

SCL1

I/O pin

IRQ5 input pin

When the IRQ5E bit in IER is set to 1, this pin is used as the

IRQ5 input pin.

When this pin is used as the SCL1 I/O pin, bits CKE1 and CKE0 in SCR of

SCI1 and bit C/

A in SMR of SCI1 must all be cleared to 0. SCL1 is an NMOS-

only output, and has direct bus drive capability.

P85/

IRQ4/RxD1

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

bit RE in SCR of SCI1 and bit P85DDR.

P85DDR

—

Pin function

P85 input pin

P85 output pin

RxD1 input pin

IRQ4 input pin

When the IRQ4E bit in IER is set to 1, this pin is used as the

IRQ4 input pin.

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