H8SLASH3003 datasheet(264/715 Pages) RENESAS

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Port 5 Data Direction Register (P5DDR): P5DDR is an 8-bit write-only register that can select

input or output for each pin in port 5.

Modes 1 and 2 (1-Mbyte Modes): Port 5 functions as a generic input/output port. A pin in port 5

becomes an output pin if the corresponding P5DDR bit is set to 1, and an input pin if this bit is

cleared to 0.

Modes 3 and 4 (16-Mbyte Modes): All P5DDR bits are fixed at 1 and port 5 functions as part of

the address bus. Bits P53DDR to P50DDR are reserved and are also fixed at 1. No bit values can

be modified.

In modes 1 and 2, P5DDR is a write-only register. Its value cannot be read. All bits return 1 when

read.

P5DDR is initialized to H'0F by a reset and in hardware standby mode. In software standby mode

it retains its previous setting, so if a P5DDR bit is set to 1, the corresponding pin maintains its

output state in software standby mode.

Bit

Mode

1/2

Initial value

Read/Write

Initial value

Read/Write

Mode

3/4

P5 DDR

—

P5 DDR

—

P5 DDR

—

P5 DDR

—

P5 DDR

—

P5 DDR

—

P5 DDR

—

P5 DDR

—

Port 5 data direction 7 to 4

These bits select input or

output for port 5 pins

Reserved bits

246

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