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The 8085 Microprocessor has five interrupts signals that can be used to interrupt a program execution. They are:
- INTR-Interrupt Request (Input): This is used as a general -purpose interrupt.
- INTA-Interrupt Acknowledge (Output): This is used to acknowledge an interrupt.
- RST 7.5, RST 6.5, RST 5.5-Restart interrupts (Inputs): These are vectored
interrupts that transfer the program controls to specify memory locations. There have higher priorities than the INTR interrupt. Among these three, the priority order is 7.5, 6.5 and 5.5.
- TRAP (Input): This is a non-mask able interrupt and has the highest priority.
In addition to the interrupts, three pins - RESET, HOLD, and READY - accept the externally initiated signals as inputs. The HOLD signal indicates that a peripheral such as a DMA (Direct Memory Access) controller is requesting the use of the address and data buses. The READY signal is used to delay the microprocessor READ or WRITE cycles until a slow-responding peripheral is ready to send or accept data. When this signal goes low, the microprocessor waits for an integral number of clock cycles until it goes high. Lastly, when the RESET IN signal goes low, the program counter is set to zero, the buses are tri-stated, and the MPU is reset and the RESET OUT signal indicates that the MPU is being reset and used to reset other devices.
To respond to the HOLD request, the 8085 Microprocessor has one signal, called HLDA (Hold Acknowledge). It acknowledges the HOLD request.
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