Z80 Datasheet, PDF (193/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

< %27 2GTKRJGTCNU
7UGT /CPWCN

Read Register Bit Functions
D7 D6 D5 D4 D3 D2 D1 D0
XX
Status Byte
Read Register 1
1 = DMA Operation has Occurred
0 = Ready Active
0 = Interrupt Pending
0 = Match Found
0 = End-of-Block
Byte Counter (Low Byte)
Read Register 2
Byte Counter (High Byte)
Read Register 3
Port A Address Counter (Low Byte)
Read Register 4
Port A Address Counter (High Byte)
Read Register 5
Port B Address Counter (Low Byte)
Read Register 6
Port B Address Counter (High Byte)
Figure 83. Read Register 0 through 6 Bit Functions
UM008101-0601
Direct Memory Access