HD64F2145 datasheet(237/829 Pages) RENESAS

237 / 829 page

Rev. 2.0, 08/02, page 197 of 788

• PA0/A16/#.,1;/CIN8

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

the IOSE bit in SYSCR and the PA0DDR bit.

Operating

Mode

Modes 1, 2 (EXPE = 0), 3

Mode 2 (EXPE = 1)

PA0DDR

IOSE

—

PA0

input pin

PA0

output pin

PA0

input pin

A16

output pin

PA0

output pin

Pin Function

.,1; input pin, CIN8 input pin*

Note:* This pin can always be used as the

.,1; or CIN8 input pin.

8.11.5

Port A Input Pull-Up MOS

Port A has an on-chip input pull-up MOS function that can be controlled by software. This input

pull-up MOS function can be specified as on or off on a bit-by-bit basis.

The input pull-up MOS for pins PA7 to PA4 is always off when IICS is set to 1. When the

keyboard buffer control pin function is selected for pins PA7 to PA2, the input pull-up MOS is

always off.

Table 8.6 summarizes the input pull-up MOS states.

Table 8.6

Input Pull-Up MOS States (Port A)

Mode

Reset

Hardware

Standby Mode

Software

Standby Mode

In Other

Operations

1, 2, 3

Off

On/Off

Legend

Off:

Input pull-up MOS is always off.

On/Off: On when the pin is in the input state, PADDR = 0, and PAODR = 1; otherwise off.

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