參數(shù)資料
型號(hào)： AT83C51RB2XXX-SLSIL
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Microcontroller
中文描述： 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 14/81頁
文件大?。?/td> 1082K
代理商： AT83C51RB2XXX-SLSIL
15
AT80C51RD2/AT83C51Rx2
4113A–8051–09/02
Expanded RAM
(XRAM)
The T8xc51Rx2 devices provide additional Bytes of Random Access Memory (RAM)
space for increased data parameter handling and high level language usage.
The devices have expanded RAM in external data space; maximum size and location
are described in Table 7.
Table 7.
Expanded RAM
The T8xc51Rx2 has internal data memory that is mapped into four separate segments.
The four segments are:
1.
The Lower 128 bytes of RAM (addresses 00h to 7Fh) are directly and indirectly
addressable.
2.
The Upper 128 bytes of RAM (addresses 80h to FFh) are indirectly addressable
only.
3.
The Special Function Registers (SFRs) (addresses 80h to FFh) are directly
addressable only.
4.
The expanded RAM bytes are indirectly accessed by MOVX instructions, and
with the EXTRAM bit cleared in the AUXR register (see Table 7).
The lower 128 bytes can be accessed by either direct or indirect addressing. The Upper
128 bytes can be accessed by indirect addressing only. The Upper 128 bytes occupy
the same address space as the SFR. That means they have the same address, but are
physically separate from SFR space.
Figure 5.
Internal and External Data Memory Address
XRAM size
Address
Start
End
T83C51RB2/RC2
T80C51RD2
1024
00h
3FFh
XRAM
Upper
128 Bytes
Internal
RAM
indirect accesses
Lower
128 Bytes
Internal
RAM
Direct or Indirect
Accesses
Special
Function
Register
Direct Accesses
80h
80h
00
0FFh or 3FFh
0FFh
00
0FFh
External
Data
Memory
0000
00FFh up to 03FFh
0FFFFh
7Fh
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