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T80C5112-RKFEL Datasheet(PDF) 28 Page - ATMEL Corporation

Part # T80C5112-RKFEL
Description  8-bit Microcontroller with A/D converter
PDF  97 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T80C5112-RKFEL Datasheet(HTML) 28 Page - ATMEL Corporation

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Rev. B - November 10, 2000
Preliminary
T80C5112
10. 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 17.) that allows the program code to switch between them (Refer to Figure 9).
Figure 9. Use of Dual Pointer
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1



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