Arbor Technology EmModule-621E, Manual

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Appendix
;--
mov AX, 2Eh
mov DX, AX
mov AL, 0F0h
out DX, AL ; select CRF0
mov AL, 00h
inc DX
out DX, AL ; set CRF0=00h, output
;--
mov AX, 2Eh
mov DX, AX
mov AL, 0Fh
out DX, AL ; select CRF, WDT Timer unit
mov AL, 00h ; bit2 =0 ->second ; bit2 =1 -> minute
inc DX
out DX, AL ; update CRF bit2 to 00h
;--
mov AX, 2Eh
mov DX, AX
mov AL, 0F6h
out DX, AL ; select CRF6, WDT Timer
mov AL, 0h
inc DX
out DX, AL ; update CRF6 to unit
;---
mov AX, 2Eh
mov DX, AX
mov AL, AAh
out DX, AX
;-- end