Rainbow-electronics T89C51CC01 Manual de usuario descargar pdf (Pagina 27)

T89C51CC01

Rev. D – 17-Dec-01

Reset Value= X00X 1100b

Not bit addressable

Table 5. AUXR1 Register

AUXR1 (S:A2h)

Auxiliary Control Register 1.

Reset Value= XXXX 00X0b

3-2 XRS1-0

ERAM size:

Accessible size of the ERAM

XRS1:0 ERAM size

0 0 256 bytes

0 1 512 bytes

1 0 768 bytes

1 1 1024 bytes (default)

1 EXTRAM

Internal/External RAM (00h - FFh)

access using MOVX @ Ri / @ DPTR

0 - Internal ERAM access using MOVX @ Ri / @ DPTR.

1 - External data memory access.

0A0

Disable/Enable ALE)

0 - ALE is emitted at a constant rate of 1/6 the oscillator frequency (or 1/3 if X2

mode is used)

1-ALEisactiveonlyduringaMOVXorMOVCinstruction.

Bit

Number

Bit

Mnemonic Description

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 ... 22 23 24 25 26 27 28 29 30 31 32 ... 148 149

T89C51CC01 1

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Rainbow-electronics T89C51CC01 Manual de usuario Pagina 27

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