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AT87C5103-ICSIL bảng dữ liệu(PDF) 16 Page - ATMEL Corporation

tên linh kiện AT87C5103-ICSIL
Giải thích chi tiết về linh kiện  Low-pin Count 8-bit Microcontroller
PDF  64 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT87C5103-ICSIL bảng dữ liệu(HTML) 16 Page - ATMEL Corporation

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AT8xC5103
4134C–8051–09/04
Dual-data Pointer
Register (DPTR)
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 device will specify the address of an
external 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 8) that allows
the program code to switch between them (Refer to Figure 7).
Figure 7. Use of Dual-data Pointer
Table 8. AUXR1: Auxiliary Register 1
Reset Value = XXXX X0X0
Note:
1. 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
76
543
210
--
---
0
-
DPS
Bit
Number
Bit
Mnemonic Description
7-3
-
Reserved(1)
The value read from this bit is indeterminate. Do not set this bit.
2
0
always stuck at 0
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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