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P20-P27 I/O Definition
0 Defines Bit as Output
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1 Port 2 Push-Pull
Reserved (Must be 0)
0 P35 = Output
1 P32 = DAV0/RDY0
0 P32 = Input
P35 = RDY0/DAV0
00 P33 = Input
P34 = Output
01 P33 = Input
10 P34 = DM
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P37 = Output
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A15 - A12, If Selected
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Reserved = 000
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B>C>A = 100
C>B>A = 101
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Reserved = 111
IRQ1, IRQ4 Priority (Group C)
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IRQ0, IRQ2 Priority (Group B)
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IRQ1 = P33 Input
IRQ2 = P31 Input
IRQ3 = P30 Input, Serial Input
IRQ4 = T0, Serial Input
IRQ5 = T1
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1 Enables Interrupts
D7 D6 D5 D4 D3 D2 D1 D0
R252 FLAGS
User Flag F1
User Flag F2
Half Carry Flag
Decimal Adjust Flag
Overflow Flag
Sign Flag
Zero Flag
Carry Flag
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D7 D6 D5 D4 D3 D2 D1 D0
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Byte (SP15 - SP8)
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