HD6432142 datasheet(304/1177 Pages) RENESAS

304 / 1177 page

Section 8 I/O Ports

Rev. 4.00 Sep 27, 2006 page 260 of 1130

REJ09B0327-0400

8.10.2

Table 8.20 summarizes the port 9 registers.

Table 8.20

Port 9 Registers

Name

Abbreviation

R/W

Initial Value

Address*

Port 9 data direction register

P9DDR

H'40/H'00*

H'FFC0

Port 9 data register

P9DR

R/W

H'00

H'FFC1

Notes: 1. Lower 16 bits of the address.

2. Initial value depends on the mode.

Port 9 Data Direction Register (P9DDR)

Bit

765

432

P97DDR P96DDR P95DDR P94DDR P93DDR P92DDR P91DDR P90DDR

Mode 1

Initial value

010

000

Read/Write

Modes 2 and 3

Initial value

000

Read/Write

P9DDR is an 8-bit write-only register, the individual bits of which specify input or output for the

pins of port 9. P9DDR cannot be read; if it is, an undefined value will be returned.

P9DDR is initialized to H'40 (mode 1) or H'00 (modes 2 and 3) by a reset and in hardware standby

mode. It retains its prior state in software standby mode.

• Modes 1, 2 and 3 (EXPE = 1)

Pin P97 functions as a bus control input (

WAIT), the IIC0 I/O pin (SDA0), or an I/O port,

according to the wait mode setting. When P97 functions as an I/O port, it becomes an output

port when P97DDR is set to 1, and an input port when P97DDR is cleared to 0.

Pin P96 functions as the

φ output pin when P96DDR is set to 1, and as the subclock input

(EXCL) or an input port when P96DDR is cleared to 0.

Pins P95 to P93 automatically become bus control outputs (

AS/IOS, HWR, RD), regardless of

the input/output direction indicated by P95DDR to P93DDR.

Pins P92 and P91 become output ports when P92DDR and P91DDR are set to 1, and input

ports when P92DDR and P91DDR are cleared to 0.

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