HD6432351 datasheet(436/1025 Pages) RENESAS

436 / 1025 page

Section 9 I/O Ports

Rev. 3.00 Sep 15, 2006 page 402 of 988

REJ09B0330-0300

9.13.3

Pin Functions

Port F pins also function as bus control signal input/output pins (

AS, RD, HWR, LWR, LCAS,

WAIT, BREQO, BREQ, and BACK) and the system clock (φ) output pin. The pin functions differ

between modes 1, 2, and 4 to 6, and modes 3 and 7. Port F pin functions are shown in table 9.24.

Table 9.24 Port F Pin Functions

Selection Method and Pin Functions

PF7/

The pin function is switched as shown below according to bit PF7DDR.

PF7DDR

Pin function

PF7 input pin

φ output pin

PF6/AS

The pin function is switched as shown below according to the operating mode

and bit PF6DDR.

Operating

Mode

Modes 1, 2, 4 to 6*

Modes 3 and 7*

PF6DDR

—

Pin function

AS output pin

PF6 input pin

PF6 output pin

PF5/RD

The pin function is switched as shown below according to the operating mode

and bit PF5DDR.

Operating

Mode

Modes 1, 2, 4 to 6*

Modes 3 and 7*

PF5DDR

—

Pin function

RD output pin

PF5 input pin

PF5 output pin

PF4/HWR

The pin function is switched as shown below according to the operating mode

and bit PF4DDR.

Operating

Mode

Modes 1, 2, 4 to 6*

Modes 3 and 7*

PF4DDR

—

Pin function

HWR output pin

PF4 input pin

PF4 output pin

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