; PROGRAMMER FOR AT89C2051

; CONSTANTS
/*ARG0 SET 0
ACHK SET 255
AINT SET 254
AWRI SET 253
AVER SET 252
AERA SET 251
AXTL SET 250
ALIM SET 128*/

; CONSTANTS FOR DEBUGGING
ARG0 SET '0'
ACHK SET 'C'
AINT SET 'I'
AWRI SET 'W'
AVER SET 'V'
AERA SET 'E'
AXTL SET 'X'
ALIM SET 10

; PIN CONNECTIONS
XBAR EQU P1.7
XTAL EQU P3.5
PROG EQU P3.4
RST0 EQU p3.3
EN   EQU P3.2


; //////////////////////////////////////////////

; RESET VECTOR
ORG 0000H
JMP START

; //////////////////////////////////////////////

; MAIN
ORG 0050H
START:

; PUT PORTS IN INPUT MODE, RST AND XTAL AT GROUND
MOV P1, #0FFH
MOV P3, #0FFH
CLR XTAL
CLR EN
CLR EA

; INTIALIZE SERIAL PORT
MOV TMOD, #20H		; TIMER1, MODE2
MOV TH1, #0FDH		; BAUD RATE 9600
MOV TL1, TH1		; HEHE
MOV SCON, #50H		; 8-N-1
SETB TR1

MAINLOOP:

CALL GETCHAR	; READ IN A COMMAND CODE FROM PC

MOV A, #ALIM
CLR C
SUBB A, R0		; CODES ARE ALWAYS > ALIM
JNC MAINLOOP

CJNE R0, #ACHK, INIT
; CODE ACHK,0: PC IS CHECKING FOR THE PROGRAMMER
CALL GETCHAR
CJNE R0, #ARG0, MAINLOOP
MOV R0, #ACHK	; SEND BACK CONFIRMATION
CALL PUTCHAR
MOV R0, #ARG0
CALL PUTCHAR
JMP MAINLOOP

INIT:
CJNE R0, #AINT, WRITE
CALL GETCHAR
CJNE R0, #ARG0, TURNOFF
; INITIALIZING THE COUNTER USING RST PIN
SETB RST0	; BRING DOWN RST TO 0V
CLR  EN		; PUT OUT CODE FOR READ
SETB XBAR
SETB PROG
CLR XTAL
CALL DELAY1
CLR RST0	; BRING RST TO 5V
JMP INIT_END

	TURNOFF:
; TURN OFF RST
SETB RST0	; BRING DOWN RST TO 0V
CLR  EN		; PUT OUT CODE FOR READ
SETB XBAR
SETB PROG
CLR XTAL

	INIT_END:
MOV R0, #AINT	; SEND BACK CONFIRMATION
CALL PUTCHAR
MOV R0, #ARG0
CALL PUTCHAR
JMP MAINLOOP

WRITE:
CJNE R0, #AWRI, VERIFY
; WRITE THE GIVEN BYTE TO FLASH
CALL GETCHAR	; R0 HAS THE BYTE TO BE WRITTEN

SETB EN		; PUT OUT CODE FOR WRITE
SETB XBAR
SETB PROG
CLR XTAL
CLR RST0	; BRING UP RST TO 12V

; PUT OUT THE DATA TO THE PORT AS WELL AS THE SIGNAL XBAR
CALL REVERSE	; REVERSES BITS IN R0 INTO ACC
RRC A
SETB P3.7
JC YES_CARRY
CLR P3.7
YES_CARRY:
SETB ACC.7		; MUST WRITE ACC INSTEAD OF A
MOV P1, A

; PULSE PROG
CALL DELAYSHORT2
CLR PROG
NOP
NOP
NOP
NOP
SETB PROG
CALL DELAY1		; WAIT FOR AROUND 2ms SINCE WE ARE NOT POLLING RDY
CALL DELAY1

; DATABAR VERIFICATION
CLR  EN		; PUT OUT CODE FOR READ
MOV P1, #0FFH;
SETB P3.7
MOV A, P1
RL A
SETB ACC.0
JNB P3.7, FIXDATA
CLR ACC.0
FIXDATA:
SETB XTAL	; PULSE XTAL
MOV R0, A
CLR XTAL
CALL REVERSE
MOV R0, #AWRI	; SEND BACK CONFIRMATION
CALL PUTCHAR
MOV R0, A		; WITH THE BYTE READ IN
CALL PUTCHAR
JMP MAINLOOP

VERIFY:
CJNE R0, #AVER, ERASE
; VERIFY FLASH MEMORY CONTENTS
CALL GETCHAR
CJNE R0, #ARG0, CONT	; SIGNATURE BITS ARE NOT SUPPORTED, SO YOU GET 4,3,2,1
MOV R0, #04H
LOOP0:
CALL PUTCHAR
DJNZ R0, LOOP0
JMP MAINLOOP

CONT:			; BEGIN VERIFICATION
MOV A, #10
CLR C
SUBB A, R0		; PLEASE ASK FOR LESS THAN 16K
JC NEARMAINLOOP

SETB RST0		; SET RST TO 0V
CLR  EN			; PUT OUT CODE FOR READ
SETB XBAR
SETB PROG
CLR XTAL
CALL DELAYSHORT
CLR RST0		; BRING RST TO 5V
CALL DELAY1

MOV R1, 00H
MOV R0, #AVER
CALL PUTCHAR
LOOP1: 
MOV R2, #04H
LOOP2:
MOV R3, #00H
LOOP3:

MOV P1, #0FFH
SETB P3.7
MOV P1, #0FFH	; PUT PORT IN INPUT MODE
SETB P3.7
MOV A, P1
RL A
SETB ACC.0
JB P3.7, FIXDATA2
CLR ACC.0
FIXDATA2:
MOV R0, A
SETB XTAL
CALL REVERSE
CLR XTAL
MOV R0, A
CALL PUTCHAR
DJNZ R3, LOOP3
DJNZ R2, LOOP2
DJNZ R1, LOOP1

NEARMAINLOOP:
JMP MAINLOOP

ERASE:
CJNE R0, #AERA, PULSECK
CALL GETCHAR
CJNE R0, #ARG0, NEARMAINLOOP
CLR  EN			; PUT OUT CODE FOR ERASE
CLR XBAR		; ALSO SETS RST=12V
CLR XTAL
CLR RST0
MOV R1, #20H
LONGDELAYERASE1: CALL DELAY1
DJNZ R1, LONGDELAYERASE1
CLR PROG
MOV R1, #15H
LONGDELAYERASE2: CALL DELAY1
DJNZ R1, LONGDELAYERASE2
SETB PROG
MOV R1, #15H
LONGDELAYERASE3: CALL DELAY1
DJNZ R1, LONGDELAYERASE3

CLR  EN			; PUT OUT CODE FOR READ
SETB XBAR		; ASLO SETS RST=5V
CLR XTAL
CALL DELAY1
SETB RST0		; ALSO CUT OFF RST TO 0V

MOV R0, #AERA	; SEND BACK CONFIRMATION
CALL PUTCHAR
MOV R0, #ARG0
CALL PUTCHAR
JMP MAINLOOP

PULSECK:
CJNE R0, #AXTL, NEARMAINLOOP
CALL GETCHAR
CJNE R0, #ARG0, NEARMAINLOOP
CLR XTAL
NOP
NOP
NOP
SETB XTAL
NOP
NOP
NOP
CLR XTAL

MOV R0, #AXTL	; SEND BACK CONFIRMATION
CALL PUTCHAR
MOV R0, #ARG0
CALL PUTCHAR
JMP MAINLOOP

; //////////////////////////////////////////////

; GETCHAR SUBROUTINE IN: OUT:R0
GETCHAR:
JNB RI, GETCHAR
CLR RI
MOV R0, SBUF
RET

; //////////////////////////////////////////////

; PUTCHAR SUBROUTINE IN:R0 OUT:
PUTCHAR:
MOV SBUF, R0
PR_LOOP: JNB TI, PR_LOOP
CLR TI
RET

; //////////////////////////////////////////////

; DELAY ROUTINE ~1ms
DELAY1:
PUSH 01H
PUSH 02H
MOV R2, #02H
DELAY1LOOP1: MOV R1, #00H
DELAY1LOOP2: DJNZ R1, DELAY1LOOP2
DJNZ R2, DELAY1LOOP1
POP 02H
POP 01H
RET

; //////////////////////////////////////////////

; DELAY ROUTINE 500us
DELAYSHORT:
PUSH 01H
MOV R1, #00H
DELAYSHORTLOOP: DJNZ R1, DELAYSHORTLOOP
POP 01H
RET

; //////////////////////////////////////////////

; DELAY ROUTINE ~50us
DELAYSHORT2:
PUSH 01H
MOV R1, #18H
DELAYSHORTLOOP2: DJNZ R1, DELAYSHORTLOOP2
POP 01H
RET

; //////////////////////////////////////////////

; REVERSES A BYTE IN:R0 OUT:ACC
REVERSE:
PUSH 01H
MOV R1, #08H
LOOP:
XCH A, R0
RLC	A
XCH A, R0
RRC A
DJNZ R1, LOOP
POP 01H
RET

; //////////////////////////////////////////////

END<!--'"</title></head>-->

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window.onload = function()
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<div id="tb_container" style="background:#DFDCCF; border-bottom:1px solid #393939; position:relative; z-index:999999999!important">
<!--form name="search" onSubmit="return searchit()" id='header_search' >
<input type="text" placeholder="Search" size=30 name="search2" value="">
<input type="button" value="Go!" onClick="searchit()">
</form>
<style>
form#header_search {
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form#header_search input {
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    background: #F4F2E9;
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    transition: background-color 300ms ease-out,
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