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8259 A P R O G R A M M A B L E I N T E R R U P T C O N T R O L L E R2

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8259A PROGRAMMABLE INTERRUPT CONTROLLER
NEED FOR 8259A ,[object Object],[object Object],[object Object]
8259A PIC ,[object Object],[object Object],[object Object]
8259A PIC- FEATURES ,[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- FEATURES ,[object Object],[object Object],[object Object]
8259A PIC- BLOCK DIAGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- PIN DIGRAM
8259A PIC- BLOCK DIAGRAM
8259A PIC- INTERRUPTS AND CONTROL LOGIC SECTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- INTERRUPTS AND CONTROL LOGIC SECTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- INTERRUPTS AND CONTROL LOGIC SECTION ,[object Object],[object Object],[object Object],[object Object]
8259A PIC- INTERRUPTS AND CONTROL LOGIC SECTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- BLOCK DIAGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- READ/WRITE CONTROL LOGIC SECTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- CASCADE BUFFER/ COMPARATOR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- CASCADE BUFFER/ COMPARATOR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- CASCADE BUFFER/ COMPARATOR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- INTERRUPT OPERATION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- INTERRUPT OPERATION ,[object Object],[object Object],[object Object]
8259A PIC- INTERRUPT OPERATION ,[object Object],[object Object]
8259A PIC- INTERRUPT OPERATION ,[object Object],[object Object],[object Object]
8259A PIC- INTERRUPT OPERATION ,[object Object],[object Object],[object Object],[object Object]
 
8259A PIC- COMMAND WORDS ,[object Object],[object Object],[object Object],[object Object],[object Object]
8259A PIC- ICW 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
INITIALIZATION SEQUENCE OF 8259A ICW1 & ICW2 are Compulsory command Words in the initialization sequence. ICW3 & ICW4 are Optional. ICW3 is read only when More than one 8259 used in the system ( SNGL bit in ICW1 is 0).
For 8086  Don’t Care ADI=1 for 8086 based system p
For 8085 system they are filled by A 15 -A 11 of the interrupt vector address and Least significant 3 bits are same as the respective bits of the vector address. For 8086 system they are filled by most significant 5 bits of interrupt type and the least significant 3 bits are 0, pointing to IR 0 .
 
 
 
If BUF=0,M/S is to be neglected .
 
 
 
8259A- OPERATING MODES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259-INTERRUPT PROCESS IN FULLY NESTED MODE
 
8259A- OPERATING MODES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8259A- OPERATING MODES ,[object Object],[object Object],[object Object],[object Object]
8259A- OPERATING MODES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ADDITIONAL FEATURES OF THE 8259A ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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8259 A P R O G R A M M A B L E I N T E R R U P T C O N T R O L L E R2

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  • 7. 8259A PIC- PIN DIGRAM
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  • 26. INITIALIZATION SEQUENCE OF 8259A ICW1 & ICW2 are Compulsory command Words in the initialization sequence. ICW3 & ICW4 are Optional. ICW3 is read only when More than one 8259 used in the system ( SNGL bit in ICW1 is 0).
  • 27. For 8086  Don’t Care ADI=1 for 8086 based system p
  • 28. For 8085 system they are filled by A 15 -A 11 of the interrupt vector address and Least significant 3 bits are same as the respective bits of the vector address. For 8086 system they are filled by most significant 5 bits of interrupt type and the least significant 3 bits are 0, pointing to IR 0 .
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  • 32. If BUF=0,M/S is to be neglected .
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  • 37. 8259-INTERRUPT PROCESS IN FULLY NESTED MODE
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