參數(shù)資料
型號: TS80C51RD2-MCBB
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 40 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 9/74頁
文件大?。?/td> 689K
代理商: TS80C51RD2-MCBB
Rev. C - 06 March, 2001
17
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
Figure 4. Internal and External Data Memory Address
Table 5. Auxiliary Register
AUXR
Address 08EH
-
EXTRA
M
AO
Reset value
X
0
Symbol
Function
-
Not implemented, reserved for future use.a
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.
AO
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
EXTRAM
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
XRAM
256 bytes
Upper
128 bytes
Internal
Ram
Lower
128 bytes
Internal
Ram
Special
Function
Register
80
00
FF(RA, RB, RC)/2FF (RD)
FF
00
FF
External
Data
Memory
0000
0100 (RA, RB, RC) or 0300 (RD)
FFFF
indirect accesses
direct accesses
direct or indirect
accesses
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