Crosing 2K Page Boundary Code Problem

[Suraj143]

I cannot access the table values above 2K memory.Please help.

I have mentioned the memory address (from de-assembling list) in the comments.

		call	Cal_Offset		; get the character offset
		call	ASCII_Table		; 0x0ff line
		movwf	PORTB
		----
		----	

ASCII_Table	movlw	High Table
		addwf	Offset_H,W
		movwf	PCLATH
		movlw	Low Table
		addwf	offset_L,W
		btfsc   STATUS,C
		incf	PCLATH,F
		movwf   PCL
		;
Table		retlw	b'00000000'
		retlw	b'00000000'
		retlw	b'00000000'
		retlw	b'00000000'
		retlw	b'00000000'
		;
Char_1		retlw	b'00000001'
		retlw	b'00000001'
		retlw	b'00000001'
		retlw	b'00000001'
		retlw	b'00000001'
		retlw	b'00000001'
		;	
		retlw	b'00000000'
		;----
		;----
		;----				; 0x07ff
[COLOR="Red"]Char_8		retlw	b'00000001'		; 0x0800[/COLOR]
		retlw	b'00000010'
		retlw	b'00000100'
		retlw	b'00001000'
		retlw	b'00010000'
		retlw	b'00100000'

 

[Pommie]

If ASCII_TABLE is in bank 1 (above 2k) then you need to do,

		call	Cal_Offset		; get the character offset
		[COLOR="red"]bsf	PCLATH,3[/COLOR]
		call	ASCII_Table		; 0x0ff line
		[COLOR="red"]bcf	PCLATH,3[/COLOR]
		movwf	PORTB
		----
		----	

ASCII_Table	movlw	High Table
		addwf	Offset_H,W
		movwf	PCLATH
		movlw	Low Table
		addwf	offset_L,W
		btfsc   STATUS,C
		incf	PCLATH,F
		movwf   PCL
		;
Table		retlw	b'00000000'
		retlw	b'00000000'
		retlw	b'00000000'
		retlw	b'00000000'
		retlw	b'00000000'

This will be the same for any calls to bank 1.

Mike.

 

[Suraj143]

Hi Mike it worked nicely.

Thank you very much for your support.

 

[Mosaic]

		call	Cal_Offset		; get the character offset
		[COLOR="red"]bsf	PCLATH,3[/COLOR]
		call	ASCII_Table		; 0x0ff line
		[COLOR="red"]bcf	PCLATH,3[/COLOR]
		movwf	PORTB
		----
		----	

ASCII_Table	movlw	High Table
		addwf	Offset_H,W
		movwf	PCLATH
		movlw	Low Table
		addwf	offset_L,W
		btfsc   STATUS,C
		incf	PCLATH,F
		movwf   PCL
		;
Table		dt	.0,.0,.0,.0

using the 'dt' data approach is far more compact and legible, u can use hex,decimal (as shown) or binary without the retlw instructions.

 

[Pommie]

using the 'dt' data approach is far more compact and legible, u can use hex,decimal (as shown) or binary without the retlw instructions.

I guess you missed his other thread.

Mike.