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T83C5101 Datasheet(PDF) 10 Page - ATMEL Corporation

Part # T83C5101
Description  Programmable Clock Out and Up/Down Timer/Counter 2
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T83C5101 Datasheet(HTML) 10 Page - ATMEL Corporation

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10
T8xC5101/02
4233H–8051–02/08
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 chip will specify the address of an exter-
nal 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 3.) that allows the pro-
gram code to switch between them (Refer to Figure 3).
Figure 3. Use of Dual Pointer
Table 3. AUXR1: Auxiliary Register 1
Notes: 1. User software should not write 1s to reserved bits. These bits may be used in future
8051 family products to invoke new feature. 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.
2. GF3 will not be available on first version of the RC devices.
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1
(On chip XRAM)
AUXR1
Address 0A2H
-
-
-
-
GF3
0
-
DPS
Reset value
X
X
X
X
0
0
X
0
Symbol
Function
-
Not implemented, reserved for future use.
DPS
Data Pointer Selection.
DPS
Operating Mode(1)
0
DPTR0 Selected
1
DPTR1 Selected
GF3
This bit is a general purpose user flag(2)


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