8.1.2 8254-2
0#
1#
2#

0#
0#
1#
2#

1 * * * *

D5D4/01101116
D3D2D1000101
MOV AL01110100B T/C1
OUT 43HAL 2
8.1.3 8254-2
OUT 43H, AL
OUT 40HAL
(a)
,2,BCD
D5D4=10
D1=1—T/C0D2=1—T/C1D3=1—T/C2

OUT 43HAL
IN AL41H
MOV AHAL
IN AL41H
OUT 43HAL
IN AL40H
MOV AHAL
IN AL40H
OUT 43HAL
; 2,BCD
;/OUT
OUT
NOUTCLK1 CE2OUT0CLKOUTOUTT×(N+1)/2 OUT0T×(N-1)/2T×N

(3)
http://www.njyangqs.com/
OUT01CLK
5.4—
10Tclk1
1GATECLK
MOV AL00110111BT/C0
8.1.5 8254-2

65536×0.125ms=8.192
=65536/8000=8.192
MOV AX, 8000H
OUT 90HAL
MOV AL, AH
OUT 90HAL
(3)
http://www.njyangqs.com/
1224
218000
1
2
OUT 61HAL