SPC8104 S-MOS Systems, SPC8104 Datasheet - Page 184

• Manufacturer Part Number: SPC8104
• Description: VGA LCD CONTROLLER
• Manufacturer: S-MOS Systems

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Step7:
; ADDITIONAL SUPPORT ROUTINES
;----------------------------
;----------------------------------------------------------------------------
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;
;----------------------------------------------------------------------------
br0:
RunTable:
br2:
Programming Notes and Examples
SP3-30
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
412-1.0
SPC8104