38K2 datasheet(97/358 Pages) RENESAS

97 / 358 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 15, 2006

page 78 of 130

38K2 Group

REJ09B0338-0200

HARDWARE

INDEX

[2:0]

b7:b3

–

EXB index register (EXBINDEX) [address 003316]

000

Bit name

Bit symbol

At reset

Function

H/W

S/W

Index bits

Not used

The accessible register, using the register window,

depends on these index bits contents as follows:

b2b1b0

0 0 0 : External I/O configuration register

0 0 1 : Transmit/Receive buffer register

0 1 0 : Memory channel operation mode register

0 1 1 : Memory address counter

1 0 0 : End address register

1 0 1 : Do not set.

1 1 0 : Do not set.

1 1 1 : Do not set.

Write “0” when writing.

“0” is read when reading.

–: State remaining

Fig. 111 Structure of EXB index register

LOW_WIN

[7:0]

In-

definite

In-

definite

Bit name

Bit symbol

At reset

Function

H/W

S/W

–

The accessible register, using this register window,

depends on the EXB index register contents as

follows:

Index value

“0016”

: External I/O configuration register

“0116”

: Transmit/Receive buffer register

“0216”

: Memory channel operation mode register

“0316”

: Memory address counter

“0416”

: End address register

HIGH_WIN

[7:0]

In-

definite

In-

definite

Bit name

Bit symbol

At reset

Function

H/W

S/W

–

The accessible register, using this register window,

depends on the EXB index register contents as

follows:

Index value

“0016”

: External I/O configuration register

“0116”

: Transmit/Receive buffer register

“0216”

: Memory channel operation mode register

“0316”

: Memory address counter

“0416”

: End address register

Fig. 112 Structure of Register window 1

Fig. 113 Structure of Register window 2

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