Datasheet

AT89C5132

4173C–USB–07/04

Registers Table 6. AUXR1 Register

AUXR1 (S:A2h) – Auxiliary Register 1

Reset Value = XXXX 00X0b

76543210

- - ENBOOT - GF3 0 - DPS

Bit

Number

Bit

Mnemonic Description

7 - 6 -

Reserved

The values read from these Bits are indeterminate. Do not set these Bits.

5 ENBOOT

Enable Boot Flash

Set this bit to map the boot Flash in the code space between at addresses F000h

to FFFFh.

Clear this bit to disable boot Flash.

Reserved

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

3GF3

General Flag

This bit is a general-purpose user flag.

Always Zero

This bit is stuck to logic 0 to allow INC AUXR1 instruction without affecting GF3

flag.

1-Reserved for Data Pointer Extension.

0DPS

Data Pointer Select Bit

Set to select second data pointer: DPTR1.

Clear to select first data pointer: DPTR0.