Philips P89LPC902, P89LPC901, P89LPC903 user manual Fmadrl

Philips Semiconductors						User’s Manual - Preliminary -
FLASH PROGRAM MEMORY						P89LPC901/902/903
r
;*	Inputs:	data	to write(byte)			*
;*	R5 =					*
;*	R7 = element address(byte)					*
;*	Outputs:					*
;*	None					*
CONF EQU		6CH
WR_ELEM:		FMADRL,R7		;write the address
	MOV
	MOV	FMCON,#CONF		;load CONF command
	MOV	FMDAT,R5		;write	the data
	MOV	R7,FMCON		;copy status for return
	MOV	A,R7		;read status
	ANL	A,#0FH		;save only four lower bits
	JNZ	BAD		;see if good or bad
	CLR	C		;clear error flag if good
	RET			;and return
BAD:		C		;set error flag if bad
	SETB
	RET			;and return
		Figure 14-4: Assembly language routine to erase/program a flash element
unsigned char			Fm_stat;		// status result
bit PGM_EL (unsigned char, unsigned char);
bit prog_fail;
void main ()
{	prog_fail=PGM_EL(0x02,0x1C);
}
bit PGM_EL (unsigned char el_addr, unsigned char el_data)
	{	#define CONF		0x6C	// access flash elements
	FMADRL		= el_addr;	//write element address to addr reg
	FMCON = CONF;			//load command, clears page reg
	FMDATA		= el_data;	//write		data and start the cycle
	Fm_stat = FMCON;			//read the result status
	if ((Fm_stat & 0x0F)!=0) prog_fail=1; else prog_fail=0;
	return(prog_fail);
	}
		Figure 14-5: C-language routine to erase/program a flash element

2003 Dec 8 98