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AT83C5136-RDTUL 数据表(PDF) 60 Page - ATMEL Corporation

部件名 AT83C5136-RDTUL
功能描述  8-bit Microcontroller with Full Speed USB Device
PDF  171 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT83C5136-RDTUL 数据表(HTML) 60 Page - ATMEL Corporation

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60
AT83C5134/35/36
7683B–USB–03/07
Dual Data Pointer
Register
The additional data pointer can be used to speed up code execution and reduce code
size.
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 = AUXR1.0 (see Table 51) that allows the program
code to switch between them (see Figure 30).
Figure 30. Use of Dual Pointer
Table 51. AUXR1 Register
AUXR1- Auxiliary Register 1(0A2h)
Reset Value = xxxx x0x0b
Not bit addressable
a. Bit 2 stuck at 0; this allows to use INC AUXR1 to toggle DPS without changing GF3.
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1
7
6
5
4
3
2
1
0
-
-
-
-
GF3
0
-
DPS
Bit
Number
Bit
Mnemonic
Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
GF3
This bit is a general-purpose user flag.
2
0
Always cleared.
1
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0
DPS
Data Pointer Selection
Cleared to select DPTR0.
Set to select DPTR1.



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