参数资料
型号: AT89C51IC2-SLRUM
厂商: Atmel
文件页数: 59/140页
文件大小: 0K
描述: IC 8051 MCU 32K FLASH 44-PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 500
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: I²C,SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 标准包装
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
其它名称: AT89C51IC2-SLRUMDKR
25
AT89C51IC2
4301D–8051–02/08
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 21) that allows the program
code to switch between them (Refer to Figure 7).
Figure 7. Use of Dual Pointer
Table 21. AUXR1 register
AUXR1- Auxiliary Register 1(0A2h)
Reset Value: XXXX XX0X0b
Not bit addressable
Note:
*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
-
ENBOOT
-
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
ENBOOT
Enable Boot Flash
Cleared to disable boot rom.
Set to map the boot rom between F800h - 0FFFFh.
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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