TS80C51RA2-ECAB 查看數據表（PDF） - Atmel Corporation

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TS80C51RA2-ECAB

High Performance 8-bit Microcontrollers

Atmel Corporation 

TS80C51RA2/RD2

TS83C51RB2/RC2/RD2

TS87C51RB2/RC2/RD2

FF(RA, RB, RC)/2FF (RD)

XRAM

256 bytes

00

FF

Upper

128 bytes

Internal

Ram

indirect accesses

80

FF

Special

Function

Register

direct accesses

80

FFFF

External

Data

Memory

Lower

128 bytes

Internal

Ram

direct or indirect

accesses

00

0100 (RA, RB, RC) or 0300 (RD)

0000

Figure 4. Internal and External Data Memory Address

Table 5. Auxiliary Register AUXR

AUXR

Address 08EH

Reset value

-

-

-

-

-

-

EXTRA

M

AO

X

X

X

X

X

X

0

0

Symbol

-

AO

EXTRAM

Function

Not implemented, reserved for future use.a

Disable/Enable ALE

AO

Operating Mode

0

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

X2 mode is used)

1

ALE is active only during a MOVX or MOVC instruction

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

EXTRAM Operating Mode

0

Internal XRAM access using MOVX @ Ri/ @ DPTR

1

External data memory access

a. User software should not write 1s to reserved bits. These bits may be used in future 8051 family

products to invoke new features. In that case, the reset or inactive value of the new bit will be 0, and

its active value will be 1. The value read from a reserved bit is indeterminate.

Rev. C - 06 March, 2001

17

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