Datasheet

Section 8 I/O Ports

Rev.7.00 Feb. 14, 2007 page 258 of 1108

REJ09B0089-0700

PA3

PA2

PA1

PA0

(I/O)

Port A

Figure 8.8 Port A Pin Functions (Mode 7)

Note: * Modes 6 and 7 are not available in the ROMless versions.

8.6.4 MOS Input Pull-Up Function

Port A has a built-in MOS input pull-up function that can be controlled by software. This MOS

input pull-up function can be used in modes 6 and 7

, and cannot be used in modes 4 and 5. MOS

input pull-up can be specified as on or off on an individual bit basis.

When PADDR bits are cleared to 0, setting the corresponding PAPCR bits to 1 turns on the MOS

input pull-up for that pins.

The MOS input pull-up function is in the off state after a reset, and in hardware standby mode.

The prior state is retained in software standby mode.

Table 8.10 summarizes the MOS input pull-up states.

Table 8.10 MOS Input Pull-Up States (Port A)

Modes

Reset

Hardware Standby

Mode

Software Standby

Mode

In Other

Operations

6, 7

PA3 to PA0 OFF OFF ON/OFF ON/OFF

4, 5 PA3 to PA0 OFF OFF

Legend:

OFF: MOS input pull-up is always off.

ON/OFF: On when PADDR = 0 and PAPCR = 1; otherwise off.

Note: * Modes 6 and 7 are not available in the ROMless versions.