DMP Electronics eBOX-3350MX-AP Manual de usuario descargar pdf (Pagina 110)

Jan Yin Chan Electronics Co.,LTD. 386SX Single Chip PC

M6117D : System on a chip

DM&P

Jan Yin Chan Electronics Co,. LTD. M6117D 386SX Single Chip PC Page 109

8F-1,No.22,Wuchyuan 2RD.,Hsin Chuang city Taipei Hsien, Taiwan, R.O.C. Tel: 886-(02) 2298-0770 Fax: (02) 2299-1883

Example E: Set GPIO[7-0] is output pin, GPIO[15-8] is input pin.

; Please use TASM to compiler the following program.

; Execute under DOS environment.

;

.286

.model small

.code

Start proc c

mov ax,0c513h ; Unlock configuration register

call writechip

mov ax,0ff4eh ; Enable GPIO[7-0] is output pin.

call writechip

mov ax,004fh ; Set the GPIO[15-8] is input pin.

call writechip ;

mov ax,5547h ; Output data value is 55h to output pin GPIO[7-0].

call writechip

mov ax,004ah ; Input data value from GPIO[15-8].

call readchip ;

mov ax,0013h ; Lock configuration register

call writechip

mov ax,4c00h

int 21h

endp

readchip proc c

out 22h,al

nop

in al,23h

nop

ret

endp

writechip proc c

out 22h,al

nop

xchg ah,al

out 23h,al

nop

xchg ah,al

ret

endp

end

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DMP Electronics eBOX-3350MX-AP Manual de usuario Pagina 110

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