- 您现在的位置：买卖IC网 > PDF目录381492 > AT80C51RB2-RLTUM (Atmel Corp.) 80C51 High Performance ROM 8-bit Microcontroller PDF资料下载
参数资料
| 型号： | AT80C51RB2-RLTUM |
| 厂商： | Atmel Corp. |
| 英文描述： | 80C51 High Performance ROM 8-bit Microcontroller |
| 中文描述： | 80C51的高性能ROM的8位微控制器 |
| 文件页数： | 14/83页 |
| 文件大小： | 672K |
| 代理商： | AT80C51RB2-RLTUM |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页
15
AT80C51RD2/AT83C51Rx2
4113B–8051–03/05
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
相关PDF资料 |
PDF描述 |
|---|---|
| AT80C51RB2-SLSCM | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSIL | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSIM | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSUL | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSUM | 80C51 High Performance ROM 8-bit Microcontroller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT80C51RB2-SLSCM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSIL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSIM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSUL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSUM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
发布紧急采购，3分钟左右您将得到回复。