?? hust_writefifo.s
字號:
;void write_fifo (void)
.section .text,"ax",@progbits
.global _write_fifo
.func write_fifo,_write_fifo
_write_fifo:
push wreg
push $80
push $81
push iph
push ipl
; clrb XCFG,7
mov w,#0x00
mov 0x0026,w ;RB口輸出
mov 0x002E,w ;rd
mov w,#%hi8data(_data_write)
mov IPH,w
mov w,#%lo8data(_data_write)
mov IPL,w
mov w,#7
mov $80,w
setb 0x0025,1
back1:
setb 0x0025,0
clrb 0x0025,2
mov w,(ip)
mov 0x002D,w
nop
nop
setb 0x0025,2
nop
nop
inc IPL
clrb 0x0025,0
mov w,#187
mov $81,w
back2:
clrb 0x0025,2
mov w,(ip)
mov 0x002D,w
nop
nop
setb 0x0025,2
nop
nop
inc IPL
decsz $81
jmp back2
decsz $80
jmp back1
clrb 0x0025,1
; setb XCFG,7
pop ipl
pop iph
pop $81
pop $80
pop wreg
ret
.endfunc
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