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AT87C5111-ICSIL データシート(PDF) 23 Page - ATMEL Corporation

部品番号 AT87C5111-ICSIL
部品情報  Low Pin Count 8-bit Microcontroller with A/D Converter
PDF  86 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT87C5111-ICSIL データシート(HTML) 23 Page - ATMEL Corporation

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AT8xC5111
4190A–8051–11/02
Dual Data Pointer
Register
The additional data pointer can be used to speed up code execution and reduce code
size in a number of ways.
The dual DPTR structure is a way by which the chip will specify the address of an exter-
nal data memory location. There are two 16-bit DPTR registers that address the external
memory, and a single bit called DPS = AUXR1/bit0 (see Table 19) that allows the pro-
gram code to switch between them (See Figure 6).
Figure 1. Use of Dual Pointer
Table 1. AUXR1: Auxiliary Register 1
Note:
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 value of the new bit will be
0, and its active value will be 1. The value read from a reserved bit is indeterminate.
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1
765
43210
-------
DPS
Bit
Number
Bit
Mnemonic Description
7-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
1-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0DPS
Data Pointer Selection
Clear to select DPTR0.
Set to select DPTR1.



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