AT89C51ID2-SMSIM ATMEL [ATMEL Corporation], AT89C51ID2-SMSIM Datasheet - Page 27

• Manufacturer Part Number: AT89C51ID2-SMSIM
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

4289A–8051–09/03
Table 22. AUXR1 register
AUXR1- Auxiliary Register 1(0A2h)
Reset Value: XXXX XX0X0b
Not bit addressable
Note:
ASSEMBLY LANGUAGE
Number
; 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
;
0000 909000MOV DPTR,#SOURCE ; address of SOURCE
0003 05A2 INC AUXR1 ; switch data pointers
0005 90A000 MOV DPTR,#DEST ; address of DEST
0008
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
Bit
7
7
6
5
4
3
2
1
0
-
*Bit 2 stuck at 0; this allows to use INC AUXR1 to toggle DPS without changing GF3.
LOOP:
AUXR1 EQU 0A2H
Mnemonic Description
ENBOOT
DPS
GF3
Bit
6
0
-
-
-
-
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Enable Boot Flash
Cleared to disable boot ROM.
Set to map the boot ROM between F800h - 0FFFFh.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
This bit is a general purpose user flag. *
Always cleared.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Data Pointer Selection
Cleared to select DPTR0.
Set to select DPTR1.
ENBOOT
5
4
-
GF3
3
2
0
AT89C51ID2
1
-
DPS
0
27