H8SLASH3028F datasheet(290/923 Pages) RENESAS

290 / 923 page

Rev. 2.00, 09/03, page 260 of 890

8.5.2

Table 8.6 summarizes the registers of port 4.

Table 8.6

Port 4 Registers

Address*

Name

Abbreviation

R/W

Initial Value

H'EE003

Port 4 data direction register

P4DDR

H'00

H'FFFD3

Port 4 data register

P4DR

R/W

H'00

H'EE03E

Port 4 input pull-up control register

P4PCR

R/W

H'00

Note: * Lower 20 bits of the address in advanced mode.

Port 4 Data Direction Register (P4DDR): P4DDR is an 8-bit write-only register that can select

input or output for each pin in port 4.

Bit

Initial value

Read/Write

P4 DDR

Port 4 data direction 7 to 0

These bits select input or output for port 4 pins

P4 DDR

Modes 1 to 5 (Expanded Modes): When all areas are designated as 8-bit-access areas by the bus

controller’s bus width control register (ABWCR), selecting 8-bit bus mode, port 4 functions as an

input/output port. In this case, a pin in port 4 becomes an output port if the corresponding P4DDR

bit is set to 1, and an input port if this bit is cleared to 0.

When at least one area is designated as a 16-bit-access area, selecting 16-bit bus mode, port 4

functions as part of the data bus, regardless of the P4DDR settings.

Modes 6 and 7 (Single-Chip Mode): Port 4 functions as an input/output port. A pin in port 4

becomes an output port if the corresponding P4DDR bit is set to 1, and an input port if this bit is

cleared to 0.

P4DDR is a write-only register. Its value cannot be read. All bits return 1 when read.

P4DDR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode

it retains its previous setting.

ABWCR and P4DDR are not initialized in software standby mode. Therefore, if a transition is

made to software standby mode while port 4 is functioning as an input/output port and a P4DDR

bit is set to 1, the corresponding pin maintains its output state.

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