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QWhat happens in mode 1 of Z80?

ID: #10471 Embedded System 81 views
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  • A Interrupt vector is supplied via the external bus ✔ ✖
  • B Interrupt vector is supplied via peripherals ✔ ✖
  • C Non-maskable interrupt (NMI) is initiated ✔ ✖
  • D Interrupt is acknowledged by the peripheral ✔ ✖
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Z80 has two interrupt modes, mode 0 and mode 1. In mode 1, the interrupt vector is supplied via the external data bus when an interrupt request is received. Also, the memory refresh register is used to control the on-chip dynamic random-access memory (DRAM) refresh circuitry.

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