参数资料
型号: AT80C51RD2-SLSUM
厂商: Atmel
文件页数: 4/81页
文件大小: 0K
描述: IC 8051 MCU 5V SPI 20MHZ 44-PLCC
标准包装: 972
系列: 80C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器类型: ROMless
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-PLCC
包装: 管件
12
4113D–8051–01/09
AT80C51RD2
7.
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 external 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 7-1) that allows the program code to switch
between them (Refer to Figure 7-1).
Figure 7-1.
Use of Dual Pointer
Table 7-1.
AUXR1 Register
AUXR1- Auxiliary Register 1(0A2h)
Reset Value: XXXX XXXX0b
Not bit addressable
Note:
1. 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
765
4321
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
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).
1-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0DPS
Data Pointer Selection
Cleared to select DPTR0.
Set to select DPTR1.
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