AT89C5131-RDTIL datasheet(48/176 Pages) ATMEL

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AT89C5131

4136B–USB–09/03

Reset Value = 0X0X 1100b

Not bit addressable

Table 46. AUXR Register

AUXR - Auxiliary Register (8Eh)

7654

3210

DPU

XRS1

XRS0

EXTRAM

Bit

Number

Bit

Mnemonic

Description

7DPU

Disable Weak Pull Up

Cleared to enabled weak pull up on standard Ports.

Set to disable weak pull up on standard Ports.

Reserved

The value read from this bit is indeterminate. Do not set this bit

5M0

Pulse length

Cleared to stretch MOVX control: the RD and the WR pulse length is 6 clock

periods (default).

Set to stretch MOVX control: the RD and the WR pulse length is 30 clock

periods.

Reserved

The value read from this bit is indeterminate. Do not set this bit

3XRS1

ERAM Size

XRS1

XRS0

ERAM size

256 bytes

512 bytes

768 bytes

1024 bytes (default)

2XRS0

1EXTRAM

EXTRAM bit

Cleared to access internal ERAM using MOVX at Ri at DPTR.

Set to access external memory.

0AO

ALE Output bit

Cleared, ALE is emitted at a constant rate of 1/6 the oscillator frequency (or

1/3 if X2 mode is used) (default).

Set, ALE is active only when a MOVX or MOVC instruction is used.

AT89C5131-RDTIL データシート(PDF) 48 Page - ATMEL Corporation

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