HD64F2145 datasheet(233/829 Pages) RENESAS

233 / 829 page

Rev. 2.0, 08/02, page 193 of 788

8.11.3

Port A Input Data Register (PAPIN)

PAPIN indicates the port A state.

Bit

Bit Name

Initial Value

R/W

Description

PA7PIN

Undefined*

PA6PIN

Undefined*

PA5PIN

Undefined*

PA4PIN

Undefined*

PA3PIN

Undefined*

PA2PIN

Undefined*

PA1PIN

Undefined*

PA0PIN

Undefined*

Reading PAPIN always returns the pin states.

PAPIN has the same address as PADDR. If a write

is performed, the port A settings will change.

Note:* The initial value is determined according to the PA7 to PA0 pin states.

8.11.4

Pin Functions

• PA7/A23/.,148/CIN15/PS2CD

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

the KBIOE bit in KBCRH_2 of the keyboard buffer controller, the IOSE bit in SYSCR, and

the PA7DDR bit.

Operating

Mode

Modes 1, 2 (EXPE = 0), 3

Mode 2 (EXPE = 1)

KBIOE

PA7DDR

—

IOSE

—

PA7

input pin

PA7

output pin

PS2CD

output pin

PA7

input pin

A23 output

PA7 output

PS2CD

output pin

Pin Function

.,148 input pin, CIN15 input pin, PS2CD input pin*

Note:* When the KBIOE bit is set to 1 or the IICS bit in STCR is set to 1, this pin is an NMOS

open-drain output, and has direct bus drive capability. This pin can always be used as the

PS2CD,

.,148, or CIN15 input pin.

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