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TS80C54 데이터시트(PDF) 11 Page - ATMEL Corporation

부품명 TS80C54
상세설명  Programmable Clock Out and Up/Down Timer/Counter 2
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제조업체  ATMEL [ATMEL Corporation]
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11
4431E–8051–04/06
AT/TS8xC54/8X2
7.
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 7-1.) that allows the program code to switch between them
(Refer to Figure 7-1).
Figure 7-1.
Use of Dual Pointer
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1


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