Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

AT8052 Interface to M25PE80(serial flash memory) problem.

Status
Not open for further replies.
E

EdwinTan

Newbie level 1
Joined
Dec 8, 2005
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,288
at8052

hi, guy.
i facing a problem with the M25PE80(serial flash memory using SPI). I cannt erase the data inside the M25PE80. i dunno whether is my programming problem or my schematic problem. BUT I can write and read from the M25PE80 but cannot erase data... this make me cannot rewrite the data.. I am using the assembly to program the AT8052 to interface the M25PE80.
Below was my Erase module code, hope u all can help me check it out the problem.

Code: 
WRITE_EN:		
	MOV	A,#06H              ;instruction for WRITE EN
	MOV	BITCNT,#08H         ;send 1 bytes at once
	CLR	CS	               ;enable the M25PE80 through /CS
	CLR	C
SEND_WREN_CODE:	
	CLR   SCL
	RLC   A
	MOV   SDA,C
	NOP
	SETB   SCL
	NOP
	DJNZ   BITCNT,SEND_WREN_DATA
	SETB   WC1	               ;indicated the M25PE80 start          
	                           ;process the data after all data were 
                              ;done		
	CALL	DLY1MS
	
PAGE_ERASE:
	
	MOV	A,#0DBH               ;instruction for PAGE ERASE
	MOV	R0,#RAM_EE1     ;contain 3 BYTES address for start erase
	MOV	BYTECNT,#03H   
	MOV	BITCNT,#08H      ;send 1 bytes at once
	CLR 	CS                      ;enable the M25PE80 through /CS
	CLR	C
	
	
SEND_PE_CODE:
	CLR	SCL                      ;CLK OF M25PE80    
	RLC	A
	MOV 	SDA,C                   ;DATA OF M25PE80
	NOP	
	SETB	SCL
	NOP
	DJNZ	BITCNT,SEND_PE_CODE
SEND_PE__ADDRESS:	
	MOV	A,@R0
	MOV	BITCNT,#08H
	
SEND_PE_ADDRESS_LOOP:	
	CLR	SCL	
	RLC	A
	MOV	SDA,C
	NOP
	SETB	SCL
	NOP
	DJNZ	BITCNT,SEND_PE_ADDRESS_LOOP1
	INC	R0
	DJNZ	BYTECNT,SEND_PE_ADDRESS
	NOP
	NOP
	SETB	CS                          ;indicated the M25PE80 start          
	                                              ;process the data after all data were 
                                                              ;done
	CALL	DLY10MS                 
	CALL	DLY1MS
	RET

u can download the M25PE80 from the ST as below
[url]https://www.st.com/stonline/products/literature/ds/11517/m25pe80.pdf
[/url]

THKS for ur help...
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top