TS80C54X2YYY-MICR Atmel Corporation, TS80C54X2YYY-MICR Datasheet - Page 10
TS80C54X2YYY-MICR
Manufacturer Part Number
TS80C54X2YYY-MICR
Description
8-bit CMOS Microcontroller 16/32 Kbytes ROM/OTP
Manufacturer
Atmel Corporation
Datasheet
1.TS80C54X2YYY-MICR.pdf
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TS80C54X2/C58X2
TS87C54X2/C58X2
6.2 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).
External Data Memory
7
0
DPS
DPTR1
DPTR0
AUXR1(A2H)
DPH(83H) DPL(82H)
Figure 3. Use of Dual Pointer
10
Rev. C - 15 January, 2001
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