XR88C681CP Datasheet, PDF (43/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART)

XR88C681
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Table 12. Z-80 CPU Restart Instructions
Used with Vectored Interrupts
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that if the IEI input to the DUART (or Zilog peripheral
device) is “low” then the DUART (or Zilog peripheral
device) will be disabled from generating any interrupt
requests to the CPU
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