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Z80 Datasheet(PDF) 329 Page - Zilog, Inc.

Part # Z80
Description  Z80 CPU PERIPHERALS
PDF  330 Pages
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z80 Datasheet(HTML) 329 Page - Zilog, Inc.

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Z80 CPU Peripherals
User Manual
UM008101-0601
Serial Input/Output
309
executed or a RETI command is written to the Z80 SIO, resetting the
interrupt-under-service latch of the Channel A interrupt. At this time, the
service routine for Channel B is resumed. When the service routine is
completed, another RETI instruction is executed to complete the interrupt
service.
Figure 132. Typical Interrupt Service
IEI
High
+
High
5. Channel B Transmitter Service Routine Complete, Second RETI Issued.
Channel A
Receiver
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
Service Completed
IEI
High
+
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
+
Low
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
IEO
Service Resumed
Low
4. Channel A External/Status Routine Complete, RETI Issued, Channel B Transmitter Service Resumed.
IEI
High
+
Low
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
IEO
Service Suspended
Low
IEI
High
+
Low
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
High
IEO
IEI
IEO
Under Service
Low
Channel A
Transmitter
Channel A
External Status
Channel B
Receiver
Channel B
Transmitter
Channel B
External Status
3. External/Status Channel A Interrupts Suspending Service of Channel B Transmitter.
2. Channel B Transmitter Interrupts and is Acknowledged.
1. Priority Interrupt Daisy Chain before Any Interrupt Occurs.



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