参数资料
型号: AT89C51ID2-SLRUM
厂商: Atmel
文件页数: 77/157页
文件大小: 0K
描述: IC 8051 MCU 64K 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: 60MHz
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: 64KB(64K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 2K 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
其它名称: AT89C51ID2-SLRUMDKR
26
AT89C51ID2
4289C–8051–11/05
Table 23. 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.
ASSEMBLY LANGUAGE
; Block move using dual data pointers
; Modifies DPTR0, DPTR1, A and PSW
; note: DPS exits opposite of entry state
; unless an extra INC AUXR1 is added
;
00A2
AUXR1 EQU 0A2H
;
0000 909000MOV DPTR,#SOURCE ; address of SOURCE
0003 05A2 INC AUXR1 ; switch data pointers
0005 90A000 MOV DPTR,#DEST ; address of DEST
0008
LOOP:
0008 05A2 INC AUXR1 ; switch data pointers
000A E0 MOVX A,@DPTR ; get a byte from SOURCE
000B A3 INC DPTR ; increment SOURCE address
000C 05A2 INC AUXR1 ; switch data pointers
000E F0 MOVX @DPTR,A ; write the byte to DEST
000F A3 INC DPTR ; increment DEST address
0010 70F6JNZ LOOP ; check for 0 terminator
0012 05A2 INC AUXR1 ; (optional) restore DPS
76
543
210
-
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.
5ENBOOT
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.
3GF3
This bit is a general purpose user flag. *
20
Always cleared.
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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