H8SLASH3021 datasheet(158/712 Pages) RENESAS

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7. I/O Ports

Rev.2.00 Mar. 22, 2007 Page 134 of 684

REJ09B0352-0200

Table 7.2

Port 1 Registers

Initial Value

Address*

Name

Abbreviation

R/W

Modes 1, 3

Modes 5 to 7

H'FFC0

Port 1 data direction

P1DDR

H'FF

H'00

H'FFC2

Port 1 data register

P1DR

R/W

H'00

Note:

∗ Lower 16 bits of the address.

Port 1 Data Direction Register (P1DDR): P1DDR is an 8-bit write-only register that can select

input or output for each pin in port 1.

Bit

Modes

1, 3

Initial value

Read/Write

Initial value

Read/Write

Modes

5 to 7

P1 DDR

—

P1 DDR

—

P1 DDR

—

P1 DDR

—

P1 DDR

—

P1 DDR

—

P1 DDR

—

P1 DDR

—

Port 1 data direction 7 to 0

These bits select input or

output for port 1 pins

P1DDR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode

it retains its previous setting. If a P1DDR bit is set to 1, the corresponding pin maintains its output

state in software standby mode.

Port 1 Data Register (P1DR): P1DR is an 8-bit readable/writable register that stores data for pins

7 to P10.

Bit

Initial value

Read/Write

R/W

Port 1 data 7 to 0

These bits store data for port 1 pins

R/W

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