In SX Microcontrollers, SX/B Compiler and SX-Key Tool, cbmeeks wrote:

Thanks guys.  I will try some tests tonight on some LED's to see if I am recording data correctly.

Here is a direct link to the datasheet:

[url]http://jameco.com/wcsstore/Jameco/Products/ProdDS/75037.pdf[/url]

Here is some code:

[code]
;=============================================
;	TRUTH TABLE
;=============================================
;CE	WE	OE	Data Mode
;H	X	X	High Z Standby (ISB, ISB1)
;L	H	H	High Z Output disable (ICC)
;L	H	L	DOUT Read (ICC)
;L	L	X	DIN Write (ICC)


;=============================================
;	SRAM
;=============================================
SRAM_READMODE MACRO
	setb WE				;(1)
	mov !DATA_BUS,#%11111111	;(2) Port C all input
ENDM

SRAM_WRITEMODE MACRO
	clrb WE				;(1)
	mov !DATA_BUS,#%00000000	;(2) Port C all output
ENDM

SRAM_CHIPENABLE MACRO
	clrb CE				;(1)
ENDM

SRAM_CHIPDISABLE MACRO
	setb CE				;(1)
ENDM


;=============================================
;	PIXELS
;=============================================
PLOT	MACRO x,y,c
	mov ADDR_BUS_LSB, #x
	mov ADDR_BUS_MSB, #y
	nop
	nop


	mov	DATA_BUS, #c
	nop
	nop
ENDM


;here is a portion of my read code (active scanline):

....
;we are now at 872 clocks  (10.9 µS)

;Active Scanline 52.6 µS
;Normally, this would be 52.6 * 80 = 4208 clocks
;However, we have 3 clocks for the call and 3 for the return
;So we need to run for 4202 clocks

;reset SRAM LSB
	mov ADDR_BUS_LSB, #0			;2
	mov p1, #16				;2
StartPixels
	mov VID_BUS, DATA_BUS			;2
	nop					;1
	nop					;1

	inc ADDR_BUS_LSB			;1
						;244 cycles
	mov	w, #$3D
	mov	d1, w
active_delay_0:
	decsz	d1
	jmp	active_delay_0
						;3 cycles
	jmp	$+1

	djnz p1, StartPixels			;(4/2)

;pad out the rest
	nop					;1
	nop					;1

	nop					;1
	nop					;1
						;100 cycles
	mov	w, #$19
	mov	d1, w
active_pad_0:
	decsz	d1
	jmp	active_pad_0

	ret


;My Clear Routine:

mov	d1, #0
mov	d2, #127

StartClear
	mov	DATA_BUS, #( COLOR5 + LUMA2 )
	nop	;small delay (13ns -- SRAM is 15ns so this should be enough)
	nop

	inc	ADDR_BUS_LSB
	nop
	nop

	djnz	d1,StartClear

	inc	ADDR_BUS_MSB
	nop
	nop

	djnz	d2,StartClear


[/code]

I will do the LED tests next and post my results.

Thanks!

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