iapwr.asm

来自「philips单片机IAP写功能源代码,可以进行C语言链接」· 汇编 代码 · 共 33 行

sfr AUXR1	 = 0xA2;
sfr FCF		=  0xB1;

XTAL_MHZ        EQU     11           ; Chip runs at 11MHz
?PR?_ProgramDataByte?ISA  SEGMENT CODE
RSEG ?PR?_ProgramDataByte?ISA
PUBLIC _ProgramDataByte         ; Entry Point for C Compiler
; unsigned char ProgramDataByte (unsigned int addr, unsigned char v);
; The C51 compiler passes addr in R6/R7 and v in R5

_ProgramDataByte:       MOV  AUXR1,#20H     ; ENBOOT = 1 (required on some parts)
			;CLR  EA
			ANL FCF,#0FCH
		
                        MOV   DPH,R6
                        MOV   DPL,R7
                        MOV   ACC,R5
                        MOV   R0,#XTAL_MHZ
                        MOV   R1,#02H        ; function code
                        LCALL  0x1FF0         ; Call Philips firmware
                        MOV   R7,ACC           ; C51 expects return in R7
			ORL    FCF,#01H
			MOV   AUXR1,0x00 ; ENBOOT = 0(required on some parts)
                       
		;	SETB	EA
		
			RET
		        END