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TS87C51U2 데이터시트(PDF) 11 Page - ATMEL Corporation

부품명 TS87C51U2
상세설명  Double UART 8-bit CMOS Microcontroller
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Rev. D - 15 January, 2001
11
TS80C51U2
TS83C51U2
TS87C51U2
7.2 Dual Data Pointer Register Ddptr
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 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 5.) that allows the program code to switch between them (Refer to Figure 3).
Figure 3. Use of Dual Pointer
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1


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