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=L/2*,1&'2(6127$6680(/,$%,/,7B>A = 101
B>A>C = 110
Reserved = 111
IRQ1, IRQ4 Priority (Group C)
0 IRQ1>IRQ4
1 IRQ4>IRQ1
IRQ0, IRQ2 Priority (Group B)
0 IRQ2>IRQ0
1 IRQ0>IRQ2
IRQ3, IRQ5 Priority (Group A)
0 IRQ5>IRQ3
1 IRQ3>IRQ5
Reserved (Must be 0)
)LJXUH ,QWHUUXSW3ULRULW\5HJLVWHU)K:ULWH2QO\
,QWHUUXSW5HTXHVW5HJLVWHU
7KH,QWHUUXSW5HTXHVW5HJLVWHU,54FRQWUROVLQWHUUXSWIXQFWLRQVDQGLVVKRZQLQ
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R250 IRQ
D7
D6
D5
D4 D3
D2
D1 D0
IRQ0 = P32 Input (D0 = IRQ0)
IRQ1 = P33 Input
IRQ2 = P31 Input
IRQ3 = P30 Input, Serial Input
IRQ4 = T0, Serial Input
IRQ5 = T1
Reserved (Must be 0)
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R251 IMR
D7
D6
D5
D4 D3
D2
D1 D0
1 Enables IRQ5 - IRQ0
(D0 = IRQ0)
Reserved (Must be 0)
1 Enables Interrupts
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)ODJV5HJLVWHU
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R252 FLAGS
D7
D6
D5
D4 D3
D2
D1 D0
User Flag F1
User Flag F2
Half Carry Flag
Decimal Adjust Flag
Overflow Flag
Sign Flag
Zero Flag
Carry Flag
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R253 RP
D7
D6
D5
D4 D3
D2
D1 D0
0 Reserved (Must be 0)
r4
r5
r6
Working
Register
Pointer
r7
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6WDFN3RLQWHU+LJK5HJLVWHU
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R254 SPH
D7
D6
D5
D4 D3
D2
D1 D0
Stack Pointer Upper
Byte (SP15 - SP8)
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R255 SPL
D7
D6
D5
D4 D3
D2
D1 D0
Stack Pointer Lower
Byte (SP7 - SP0)
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Data In Valid
Data In
Next Data In Valid
2
1
3
DAV
(Input)
Delayed DAV
5
4
RDY
(Output)
Delayed RDY
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Data Out
Data Out Valid
Next Data Out Valid
7
DAV
(Output)
Delayed DAV
11
9
8
10
RDY
(Input)
Delayed
RDY
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