Philips P89LPC902, P89LPC901, P89LPC903 user manual Fmcon

Philips Semiconductors										User’s Manual - Preliminary -
FLASH PROGRAM MEMORY									P89LPC901/902/903
FMCON			7		6	5	4	3	2	1	0
Address: E4h
				-	-	-	-	HVA	HVE	SV	OI
Not bit addressable
Reset Source(s): Any reset
Reset Value:
BIT	SYMBOL		FUNCTION
FMCON.7-4		-	Reserved.
FMCON.3		HVA	Set if either an interrupt or a brown-out is detected during a program or erase cycle. Also
			set if the brown-out detector is disabled at the start of a program or erase cycle.
FMCON.2		HVE	High voltage error. Set when an error occurs in the high voltage generator.
FMCON.1		SV	Security violation. Set when an attempt is made to program, erase, or CRC a secured
			sector or page.
FMCON.0		OI	Operation interrupted. Set when cycle aborted due to an interrupt or reset.
				Figure 14-1: Flash Memory Control Register
;* Inputs:					program (byte)			*
;*	R3 = number of bytes to							*
;*	R4 = page address MSB(byte)							*
;*	R5 = page address LSB(byte)							*
;*	R7 = pointer to data buffer in RAM(byte)							*
;* Outputs:								*
;*	R7 = status (byte)				set on error			*
;*	C = clear on no error,							*
LOAD	EQU	00H
EP	EQU	68H
PGM_USER:		FMCON,#LOAD			;load command, clears page register
	MOV
	MOV	FMADRH,R4			;get high address
	MOV	FMADRL,R5			;get low address
	MOV	A,R7			;
	MOV	R0,A			;get pointer into R0
LOAD_PAGE:		FMDAT,@R0			;write data to page register
	MOV
	INC	R0			;point to next byte
	DJNZ	R3,LOAD_PAGE			;do until count is zero
	MOV	FMCON,#EP			;else erase & program the page
	MOV	R7,FMCON			;copy status for return
	MOV	A,R7			;read status
	ANL	A,#0FH			;save only four lower bits
	JNZ	BAD			;
	CLR	C			;clear error flag if good
BAD:	RET				;and return
	SETB	C			;set error flag
	RET				;and return

Figure 14-2: Assembly language routine to erase/program all or part of a page

2003 Dec 8 95