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CP82C59A-5 Datasheet(PDF) 6 Page - Intersil Corporation |
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CP82C59A-5 Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 20 page 4-6 6. This completes the interrupt cycle. In the AEOI mode, the ISR bit is reset at the end of the second INTA pulse. Oth- erwise, the ISR bit remains set until an appropriate EOI command is issued at the end of the interrupt subroutine. If no interrupt request is present at step 4 of either sequence (i.e., the request was too short in duration), the 82C59A will issue an interrupt level 7. If a slave is programmed on IR bit 7, the CAS lines remain inactive and vector addresses are output from the master 82C59A. Interrupt Sequence Outputs 8080, 8085 Interrupt Response Mode This sequence is timed by three INTA pulses. During the first lNTA pulse, the CALL opcode is enabled onto the data bus. First Interrupt Vector Byte Data: Hex CD During the second INTA pulse, the lower address of the appropriate service routine is enabled onto the data bus. When interval = 4 bits, A5 - A7 are programmed, while A0 - A4 are automatically inserted by the 82C59A. When interval = 8, only A6 and A7 are programmed, while A0 - A5 are automatically inserted. During the third INTA pulse, the higher address of the appro- priate service routine, which was programmed as byte 2 of the initialization sequence (A8 - A15), is enabled onto the bus. D7 D6 D5 D4 D3 D2 D1 D0 Call Code 11001101 ADDRESS BUS (16) CONTROL BUS DATA BUS (8) I/OR I/OW INT INTA CASCADE LINES CAS 0 CAS 1 CAS 2 SP/EN CS RD WR INTA INT D7 - D0 A0 SLAVE PROGRAM/ ENABLE BUFFER INTERRUPT REQUESTS 82C59A IRQ IRQ IRQ IRQ IRQ IRQ IRQ IRQ 7 6 5 4 3 2 1 0 FIGURE 5. 82C59A STANDARD SYSTEM BUS INTERFACE CONTENT OF SECOND INTERRUPT VECTOR BYTE IR INTERVAL = 4 D7 D6 D5 D4 D3 D2 D1 D0 7 A7 A6 A5 11100 6 A7 A6 A5 11000 5 A7 A6 A5 10100 4 A7 A6 A5 10000 3 A7 A6 A5 01100 2 A7 A6 A5 01000 1 A7 A6 A5 00100 0 A7 A6 A5 00000 IR INTERVAL = 8 D7 D6 DS D4 D3 D2 D1 D0 7 A7 A6 111000 6 A7 A6 110000 5 A7 A6 101000 4 A7 A6 100000 3 A7 A6 011000 2 A7 A6 010000 1 A7 A6 001000 0 A7 A6 000000 82C59A |
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