38K2 datasheet(328/358 Pages) RENESAS

328 / 358 page

3.4 List of registers

Rev.2.00

Oct 15, 2006

page 67 of 99

38K2 Group

REJ09B0338-0200

APPENDIX

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

Fig. 3.4.68 Structure of Register window 1

EXB_CTR

INT_CTR

[2:0]

A1_CTR

b7:b5

Index = 0016 : External I/O configuration register (EXBCFGL) [address 003416]

–

000

Bit name

Bit symbol

At reset

Function

H/W

S/W

0 : Port

1 : EXB function pin

Selects a signal of P33/ExINT pin.

ON/OFF is programmed by each bit. An output logical

sum of P33/ExINT pins set for ON are performed and it

is output as an “L” active signal.

b3b2b1

0 0 1 : RxB_RDY (RxBuf ready) output

0 1 0 : TxB_RDY (TxBuf ready) output

1 0 0 : Mch_req (Memory channel request) output

Others : Do not set.

0 : Port

1 : A1 input (used to read status)

Write “0” when writing.

“0” is read when reading.

EXB pin control bit

(Pins P10 to P17, P30 to P34)

P33/ExINT pin control bit

P43/ExA1 pin control bit

Not used

–: State remaining

Fig. 3.4.69 Index00[low]; Structure of External I/O configuration register

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