Nvis 5586A
Nvis Technologies Pvt. Ltd.
153
Program 37:
Software triggered strobe (8253)
After the mode is set, the output will be high; when the count is loaded the counter will begin
counting. On terminal count, the output will go low for one in put clock period, and then will
go high again. If the count register is reloaded between output pulses the present period will
not be affected, but the subsequent period will reflect the new value. The count will be
inhibited while the gate input is low. Reloading the counter register will restart counting
beginning with the new number.
Address
Opcode
Mnemonic
Comment
Step-1
0400
B0 B8
START:
MOV
AL,B8 H
;INIT 8 253 CWR IN MODE-
4
0402
E6 06
OUT
0 6H,AL
;SET FOR COUNTER -2
Step-2
0404
B0 01
MOV
AL ,01 H
;L OAD L SB COUNT I N A CC
DATA 01 H
0406
E6 04
OUT
04H,AL
;OUT AT COUNTER-2
Step-3
0408
B0 00
MOV
AL ,00 H
;L OAD MSB COUNT IN ACC
DATA 00 H
040A
E6 04
OUT
04 H,AL
;OUT AT COUNTE R-2
Step-4
040C
EB F1 FF
JMP
S TART
;JUMP TO START
Содержание 5586A
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Страница 23: ...Nvis 5586A Nvis Technologies Pvt Ltd 23 Memory Read Timing in Maximum Mode...
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Страница 48: ...Nvis 5586A Nvis Technologies Pvt Ltd 48 Diagram of module RESET power Instruction Set Note...
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