Rainbow-electronics T89C5115 Manuel d'utilisateur télécharger pdf (Page 25)

T89C5115

4128A–8051–04/02

Table 17. AUXR1 Register

AUXR1 (S:A2h)

Auxiliary Control Register 1

Reset Value = xxxx 00x0b

76543210

– – ENBOOT – GF3 0 – DPS

Bit

Number

Bit

Mnemonic Description

7-6

–

Reserved

The value read from these bits is indeterminate. Do not set these bits.

5 ENBOOT

Enable Boot Flash

Set this bit for map the boot flash between F800h -FFFFh

Clear this bit for disable boot flash.

–

Reserved

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

3GF3General-purpose Flag 3.

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 dual data pointer: DPTR1.

Clear to select first dual data pointer: DPTR0.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 104 105

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Rainbow-electronics T89C5115 Manuel d'utilisateur Page 25