DMP Electronics eBOX-3350MX-AP Manual de usuario descargar pdf (Pagina 108)

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 107

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 C: Set GPCS1 decoder to I/O address 168h to16Bh 8bit data bus read/write.

; 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,0c45h ; Enable IO address A[15-1], 8bit data bus read/write.

call writechip

mov ax,0149h ; Set the GPCS0 A[15-8] is 01h. A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0

call writechip ; 0 0 0 0 0 0 0 1 0 1 1 0 1 0 X X = 168h -

16Bh

mov ax,6848h ; Set the GPCS0 A[7-1] is 68h.

call writechip

mov ax,004bh ; Set the GPCS0 mask A[15-8] is 00h, address A[15-8] full compare(set to" 0" is compare, set to "1" is don't care).

call writechip

mov ax,004ah ; Set the GPCS0 mask A[7-1] is 000000XXb, address A[7-2] full compare, A[1-0] is don't care.

call readchip :

and al,00000001b

or al,00000010b ;

xchg ah,al ;

call writechip ;

mov ax,0048h ;

call readchip

or al,00000001b

xchg ah,al

call writechip ; Active GPCS1 decoder single.

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 108

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