參數(shù)資料
型號(hào): Q67121-C1068
廠商: SIEMENS AG
元件分類(lèi): 8位微控制器
英文描述: 8-Bit CMOS Microcontroller
中文描述: 8位CMOS微控制器
文件頁(yè)數(shù): 20/69頁(yè)
文件大?。?/td> 1124K
代理商: Q67121-C1068
C515C
Semiconductor Group
20
1997-07-01
Multiple Datapointers
As a functional enhancement to the standard 8051 architecture, the C515C contains eight 16-bit
datapointers instead of only one datapointer. The instruction set uses just one of these datapointers
at a time. The selection of the actual datapointer is done in the special function register DPSEL.
Figure 8
illustrates the datapointer addressing mechanism.
Figure 8
External Data Memory Addressing using Multiple Datapointers
DPH(83H
DPL(82H
DPTR0
DPTR7
.0
.1
.2
-
-
-
-
-
DPSEL(92H
DPSEL
Selected
Data-
pointer
.2
.1
.0
DPTR 0
0
0
0
0
0
1
DPTR 1
0
1
0
DPTR 2
0
1
1
DPTR 3
1
0
0
DPTR 4
1
0
1
DPTR 5
1
1
0
DPTR 6
1
1
1
DPTR 7
MCD00779
External Data Memory
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