AMX TXC16 Plus Manuale Utente Pagina 168

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¡ Semiconductor MSM82C59A-2RS/GS/JS
FEDL82C59A-2-03
SYSTEM INTERFACE
BASIC OPERATION DESCRIPTION
Data transfers between the 82C59A-2 internal registers and the data bus are listed below.
A
0
Address Bus
Control Bus
D
7
- D
0
8 bits
WR INTA
Data Bus
MSM82C59A-2
CS RD INT
Cascade
Address Bus
CAS
0
CAS
1
CAS
2
SP/EN IR
0
IR
1
IR
2
IR
3
IR
4
IR
5
IR
6
IR
7
Slave
Program/Enable
Buffer
Interrupt Requests
1
0
0
0
0
A
0
Function
1
¥
¥
¥
¥
0
0
1
¥
D
4
¥
¥
¥
¥
¥
0
1
¥
¥
D
3
¥
¥
¥
¥
0
1
1
1
0
RD
1
1
¥
0
1
0
0
0
1
WR
0
1
¥
0
IRR, ISR, or Poll Word Æ Data Bus
IMR Æ Data bus
Data Bus Æ OCW2
Data Bus Æ OCW3
Data Bus Æ 1CW1
Data Bus Æ OCW1, ICW2, ICW3, ICW4
Data Bus Set to High Impedance (when INTA = 1)
Combinations Prohibited
CS
0
0
0
0
0
0
0
1
¥
Opearation
Read
Read
Write
Write
Write
Write
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