H8SXSLASH1663 datasheet(538/1158 Pages) RENESAS

538 / 1158 page

Section 9 I/O Ports

Rev.1.00 Jun. 07, 2006 Page 486 of 1102

REJ09B0294-0100

Bit

Bit Name

Initial

Value

R/W

Description

BSS

R/W

BS Output Pin Select

Selects the

BS output pin

0: Specifies pin PA0 as

BS-A output pin

1: Specifies pin PA6 as

BS-B output pin

BSE

R/W

BS Output Enable

Enables/disables the

BS output

0: Disables the

BS output

1: Enables the

BS output

RDWRS*

R/W

RD/

WR Output Pin Select

Selects the output pin for RD/

0: Specifies pin PA1 as RD/

WR-A output pin

1: Specifies pin PB6 as RD/

WR-B output pin

RDWRE*

R/W

RD/

WR Output Enable

Enables/disables the RD/

WR output

0: Disables the RD/

WR output

1: Enables the RD/

WR output

ASOE

R/W

AS Output Enable

Enables/disables the

AS output

0: Specifies pin PA6 as I/O port

1: Specifies pin PA6 as

AS output pin



Reserved

This bit is always read as 0. The write value should

always be 0.

Notes: 1. If multiple

CS outputs are specified to a single pin according to the CSn output pin

select bit (n = 2), multiple

CS signals are output from the pin. For details, see section

6.5.3, Chip Select Signals.

2. If an area is specified as a byte control SDRAM space, the pin functions as RD/

output regardless of the RDWRE bit value.

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