參數(shù)資料
型號(hào)： TS80C51RD2-VCE
廠商： International Rectifier
英文描述： High Performance 8-bit Microcontroller
中文描述： 高性能8位微控制器
文件頁數(shù)： 18/85頁
文件大?。?/td> 762K
代理商： TS80C51RD2-VCE
18
4188E–8051–08/06
AT/TS8xC51Rx2
address bits (DPL) with data. MOVX @ Ri and MOVX @DPTR will generate either read or
write signals on P3.6 (WR) and P3.7 (RD).
The stack pointer (SP) may be located anywhere in the 256 bytes RAM (lower and upper RAM)
internal data memory. The stack may not be located in the XRAM.
Figure 6-1.
Internal and External Data Memory Address
Table 6-1.
Auxiliary Register
AUXR
XRAM
256 bytes
Upper
128 bytes
Internal
Ram
indirect accesses
Lower
128 bytes
Internal
Ram
direct or indirect
accesses
Special
Function
Register
direct accesses
80
80
00
FF(RA, RB, RC)/2FF (RD)
FF
00
FF
External
Data
Memory
0000
0100 (RA, RB, RC) or 0300 (RD)
FFFF
AUXR
Address 08EH
-
-
-
-
-
-
EXTRAM
AO
Reset value
X
X
X
X
X
X
0
0
Symbol
Function
-
Not implemented, reserved for future use.
(1)
1.
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
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