NC2-51 MCU Learning Board Experimental Program Example 2

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NC2-51 MCU Learning Board Experimental Program Example 2 [Copy link]

NC2-51 MCU Learning Board Experimental Program Example

51 MCU learning board finished product picture
NS-1 download line finished product picture

Programming functions:

　The NC2-51 single-chip microcomputer learning board has built-in programming function.

Go to http://www.nnssh.com/downloads/down3.htm to download the Easy pro isp download line driver.

When using, insert the NS-1 (ISP) download cable into the computer parallel port, connect the leads to the learning board (marked on the learning board), turn on the power of the learning board, open the programming program to burn the chip.

2. 4-bit common negative digital experiment, such as counting, data display, etc.
a_bit equ 20h; thousands digit
b_bit equ 21h; hundreds digit
c_bit equ 22h; tens digit
d_bit equ 23h; ones digit
temp equ 24h; counter value storage location
temp1 equ 25h

star: mov temp,#0 ; Initialize, start from 0
mov temp1,#0
stlop: acall display; Call display subroutine
inc temp; Add 1 to counter
mov a,temp
cjne a,#100,next ; Check if it is full 100
mov temp,#0
inc temp1
mov a,temp1
cjne a,#60,next
mov temp1,#0; Clear 0
;mov temp,#0;
next: ljmp stlop; Loop if not full

;Display subroutine
display: mov a,temp ;Convert the hexadecimal number in temp to decimal
mov b,#10 ;10/10=decimal
div ab
mov b_bit,a ;The tens digit is in a
mov a_bit,b ;The ones digit is in b
mov a,temp1
mov b,#10
div ab
mov c_bit,a ;The thousands digit is in c
mov d_bit,b ;The hundreds digit is in d

mov dptr,#numtab ;specify table address
;mov r0,#2;4
dpl1: mov r1,#50;250 ;
dplop: mov a,a_bit ;get unit
digitMOVC A,@A+DPTR ;look up the 7-segment code of unit
digitmov p0,a ;send out the 7-segment code of unit
digitclr p2.6 ;turn on unit digit
displayacall d1ms ;call delay
setb p2.6;turn off displaymov
a,b_bit ;
MOVC A,@A+DPTR ;
mov p0,a ;
clr p2.5;
acall d1ms ;
setb p2.5
mov a,d_bit ;
MOVC A,@A+DPTR ;
mov p0,a ;
clr p2.4
acall d1ms
setb p2.4
mov a,c_bit
MOVC A,@A+DPTR
mov p0,a
clr p2.3;
acall d1ms;
setb p2.3

djnz r1,dplop;
;djnz r0,dpl1
ret

;2+2X80=162 microseconds delay, calculated at 12MHZ frequency
D1MS: MOV R7,#80
DJNZ R7,$
RET
;The 7-segment digital tube 0~9 digits on the experimental board display code
numtab:DB 0EBH,00AH,067H,06EH,08EH,0ECH,0EDH,02AH,0EFH,0EEH
end