DMP Electronics eBOX-3350MX-AP Manual do Utilizador descarregar pdf (Página 106)

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 105

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 A: Set timeout 16 sec to generate a system reset. Reset watchdog timer

; Please use TASM to compiler the following program. Resets the watchdog timer periodically to prevent timeout.

; Execute under DOS environment.

;

.286 mov ax,0c513h ;Unlock configuration

.model small call writechip

.code mov ax,3c3ch ; reset watchdog timer counter

Start proc c call readchip

mov ax,0c513h ; Unlock config register or al,00100000b ; The counter is reset at

out 23h,al

call writechip xchg ah,al

mov ax,3737h ; Disable watchdog timer call writechip

call readchip mov ax,0013h ; Lock configuration register

and al,10111111b call writechip

xchg ah,al

call writechip

mov ax,083bh ; Set the expected counter value (the above code uses reachip and writechip procedures)

call writechip ; to [080000h]

mov ax,003ah ; 30.5usec * 080000h = 16 sec

call writechip

mov ax,0039h

call writechip

mov ax,3838h ; Select "System reset" as timeout actiom

call readchip

and al,00001111b

or al,11010000b

xchg ah,al

call writechip

mov ax,3737h ; Enable watchdog timer

call readchip

or al,01000000b

xchg ah,al

call writechip

mov ax,0013h ; Lock config 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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