Texas Instruments TMS320C3x - Manual (Page 733)

Boot-Loader Source Code Listing
C-10
LDI 2,IOF ;*; assert data acknowledge
;*; (XF0 low to host)
loop6 TSTB 80h,IOF ;*; wait for data not ready
BZ loop6 ;*; (XF1 high from host)
LDI 6,IOF ;*; deassert data acknowledge
;*; (XF0 high to host)
RETSU
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