HD6432351 datasheet(432/1025 Pages) RENESAS

432 / 1025 page

Section 9 I/O Ports

Rev. 3.00 Sep 15, 2006 page 398 of 988

REJ09B0330-0300

PE7

PE6

PE5

PE4

PE3

PE2

PE1

PE0

Port E

(I/O)

Figure 9.24 Port E Pin Functions (Modes 3 and 7)

9.12.4

MOS Input Pull-Up Function [H8S/2351 Only]

Port E 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 1, 2, and 4 to 6 when 8-bit bus mode is selected, or in

mode 3 or 7, and can be specified as on or off on an individual bit basis.

When a PEDDR bit is cleared to 0 in mode 1, 2, 4, 5, or 6 when 8-bit bus mode is selected, or in

mode 3 or 7, setting the corresponding PEPCR bit to 1 turns on the MOS input pull-up for that pin.

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

mode. The prior state is retained after a manual reset, and in software standby mode.

Table 9.22 summarizes the MOS input pull-up states.

Table 9.22 MOS Input Pull-Up States (Port E)

Modes

Power-On

Reset

Hardware

Standby Mode

Manual

Reset

Software

Standby Mode

In Other

Operations

3, 7

8-bit bus

ON/OFF

1, 2, 4 to 6

16-bit bus

OFF

Legend:

OFF:

MOS input pull-up is always off.

ON/OFF: On when PEDDR = 0 and PEPCR = 1; otherwise off.

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