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Z80 Datasheet(PDF) 102 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) 102 Page - Zilog, Inc.

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<%27 2GTKRJGTCNU
7UGT /CPWCN
UM008101-0601
Direct Memory Access

Figure 33.
Interrupt Service Routine
Interrupt Latches
Two primary latches are associated with the interrupt structure:
• Interrupt Pending (IP). Set whenever the DMA requests an interrupt
but has not yet acknowledged. It holds the INT line Low (Figure 34).
• Interrupt Under Service (IUS). Set when the CPU acknowledges the
DMA interrupt (Figure 35). This accomplishes three things:
–
Prevents further interrupts by this DMA
MEMORY
CPU
DMA
Jump Table
IRegister
Interrupt
Vector
Jump Table
Service Routine
Program
Counter
Program
Counter
Service Routine
Write
Registers
Register
A.
B.
C.



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