AT89C55WD-24JI datasheet(8/35 Pages) ATMEL | 8-bit Microcontroller with 20K Bytes Flash

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AT89C55WD-24JI Datasheet(PDF) 8 Page - ATMEL Corporation

Part #	AT89C55WD-24JI

Description	8-bit Microcontroller with 20K Bytes Flash

Download	35 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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1921C–MICRO–3/05

AT89C55WD

Table 5-3.

AUXR: Auxiliary Register

AUXR

Address = 8EH

Reset Value = XXX00XX0B

Not Bit Addressable

–

–

–

WDIDLE

DISRTO

–

–

DISALE

Bit

7

6

5

4

3

2

1

0

–

Reserved for future expansion

DISALE

Disable/Enable ALE

DISALE

Operating Mode

0

ALE is emitted at a constant rate of 1/6 the oscillator frequency

1

ALE is active only during a MOVX or MOVC instruction

DISRTO

Disable/Enable Reset out

DISRTO

Operating Mode

0

Reset pin is driven High after WDT times out

1

Reset pin is input only

WDIDLE

Disable/Enable WDT in IDLE mode

WDIDLE

Operating Mode

0

WDT continues to count in IDLE mode

1

WDT halts counting in IDLE mode

Table 5-4.

AUXR1: Auxiliary Register 1

AUXR1

Address = A2H

Reset Value = XXXXXXX0B

Not Bit Addressable

––

–

–

–

–

–

DPS

Bit

7

6

5

4

3

2

1

0

–

Reserved for future expansion

DPS

Data Pointer Register Select

DPS

0

Selects DPTR Registers DP0L, DP0H

1

Selects DPTR Registers DP1L, DP1H

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