Z80 Datasheet, PDF (69/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

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Increment/Decrement
Source-Port Address
Read
Source-Port Data
Increment/Decrement
Destination Port Address
Write Data
to Destination Port
Byte
Match
?
NO
Increment
Byte Counter
YES
Set
Status Flag
• Continue
• Release Bus
• Interrupt
Figure 20. Transfer/Search One Byte
UM008101-0601
Direct Memory Access