H8S2245 datasheet(308/818 Pages) RENESAS

308 / 818 page

Section 8 I/O Ports

Rev.3.00 Mar. 26, 2007 Page 266 of 772

REJ09B0355-0300

8.11.2

Table 8.19 shows the port E register configuration.

Table 8.19

Port E Registers

Name

Abbreviation

R/W

Initial Value

Address*

Port E data direction register

PEDDR

H'00

H'FEBD

Port E data register

PEDR

R/W

H'00

H'FF6D

Port E register

PORTE

Undefined

H'FF5D

Port E MOS pull-up control register

PEPCR

R/W

H'00

H'FF74

Note:

Lower 16 bits of the address.

Port E Data Direction Register (PEDDR)

PE7DDR

PE6DDR

PE5DDR

PE4DDR

PE3DDR

PE0DDR

PE2DDR

PE1DDR

Bit

Initial value

R/W

PEDDR is an 8-bit write-only register, the individual bits of which specify input or output for the

pins of port E. PEDDR cannot be read; if it is, an undefined value will be read.

This register is a write-only register, and cannot be written by bit manipulation instruction. For

details, see section 2.10.4, Access Methods for Registers with Write-Only Bits.

PEDDR is initialized to H'00 by a power-on reset, and in hardware standby mode. It retains its

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

• Modes 1, 2, 4, 5, and 6

When 8-bit bus mode has been selected, port E pins function as I/O ports. Setting a PEDDR bit

to 1 makes the corresponding port E pin an output port, while clearing the bit to 0 makes the

pin an input port.

When 16-bit bus mode has been selected, the input/output direction specification by PEDDR is

ignored, and port E is designated for data I/O.

For details of 8-bit and 16-bit bus modes, see section 6, Bus Controller.

Note:

Modes 2 and 6 cannot be used in the H8S/2240.

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