AT89C51RC View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C51RC

8-bit Microcontroller with 32K Bytes Flash

Atmel Corporation 

AT89C51RC

Table 5-3.

AUXR

AUXR: Auxiliary Register

Address = 8EH

Not Bit Addressable

–

–

Bit

7

6

–

WDIDLE DISRTO

5

4

3

Reset Value = XXX00X00B

–

EXTRAM DISALE

2

1

0

–

DISALE

EXTRAM

DISRTO

WDIDLE

Reserved for future expansion

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

Internal/External RAM access using MOVX @ Ri/@DPTR

EXTRAM Operating Mode

0

Internal ERAM (00H-FFH) access using MOVX @ Ri/@DPTR

1

External data memory access

Disable/Enable Reset out

DISRTO Operating Mode

0

Reset pin is driven High after WDT times out

1

Reset pin is input only

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

–

DPS

Reserved for future expansion

Data Pointer Register Select

DPS

0

Selects DPTR Registers DP0L, DP0H

1

Selects DPTR Registers DP1L, DP1H

9

1920C–MICRO–03/05

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