38K2 datasheet(98/358 Pages) RENESAS

98 / 358 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 15, 2006

page 79 of 130

38K2 Group

REJ09B0338-0200

HARDWARE

Fig. 114 Index00[low]; Structure of External I/O configuration register

Fig. 115 Index00[high]; Structure of External I/O configuration register

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

DRQ_CTR

[1:0]

DAK_CTR

[1:0]

TC_CTR

b7:b5

Index = 0016 : External I/O configuration register (EXBCFGH) [address 003516]

–

000

Bit name

Bit symbol

At reset

Function

H/W

S/W

b1b0

0 0 : Port

0 1 : Do not set.

1 0 : ExDREQ function; RxB_RDY (RxBuf ready) output

1 1 : ExDREQ function; Mch_req (Memory channel

request) output

Specifies P41/ExDACK/TxD pin function.

Selects which mode; requiring read or write signal, or

not requiring it for use of DMA acknowledge function.

b3b2

0 0 : Port

0 1 : Do not set.

1 0 : ExDACK function; DMA acknowledge input

(Mode for read and write signals used together)

1 1 :ExDACK function; DMA acknowledge input

(Mode for read and write signals not required)

0 : Port

1 : ExTC (terminal count) input

Write “0” when writing.

“0” is read when reading.

P40/ExDREQ/RxD pin control

bit

P41/ExDACK/TxD pin control

bit

P42/ExTC/SCLK pin control bit

Not used

–: State remaining

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