SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 257

• Manufacturer Part Number: SPC8106
• Description: LCD/CRT VGA CONTROLLER
• Manufacturer: S-MOS Systems

;**********************************************************************
;
;
;
;**********************************************************************
Step7:
; ADDITIONAL SUPPORT ROUTINES
;----------------------------
;----------------------------------------------------------------------------
;
;
;
;
;
;
;----------------------------------------------------------------------------
BR0:
RunTable:
BR2:
SPC8106
411-1.0
STEP7 - Clear Vram.
mov
mov
mov
xor
xor
rep
ret
RunTable - Initialize registers from table
Entry:
Exit:
Uses:
DEC
LODSW
CMP
JE
MOV
AND
TEST
JNZ
LODSW
CMP
JE
OUT
JMP
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
ax, 0A000h;
es, ax
cx, 0FFFFh /2
di, di
ax, ax
stosw
DS:SI - Pointer to register table
n/a
AX,DX,SI
SI
AX,-1
BRX
DX,AX
DH,7Fh
AH,80h
BR3
AL,-1
BR0
DX,AX
BR2
;
;
;
;
;
; Undo last byte overrun
; Read next control word
; End of table?
; Exit if so
; Get port in DX
; Mask off port write bit
; Test if port write?
; Jump if so
; Read index,data
; End of run
; Jump back if so
; Write the data
; Back for more
X12-AN-003-02
Programming Notes and Examples
SP3-31