參數(shù)資料
型號: SAB83C517A-5N18-T4
文件頁數(shù): 26/77頁
文件大?。?/td> 1358K
代理商: SAB83C517A-5N18-T4
SAB 80C517A/83C517A-5
Semiconductor Group
25
1994-05-01
Multiple Datapointers
As a functional enhancement to standard 8051 controllers, the SAB 80C517A contains eight
16-bit datapointers. The instruction set uses just one of these datapointers at a time. The
selection of the actual datapointer is done in special function register DPSEL (data pointer
select, addr. 92
H
). Figure 3 illustrates the addressing mechanism.
Figure 3
Addressing of External Data Memory
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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