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Z80 Datasheet(PDF) 209 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 209 Page - Zilog, Inc. |
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209 / 330 page  < %27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Parallel Input/Output SelectingAnOperating Mode PIO Port A allows operation in four modes: Mode 0 (output mode), Mode 1 (input mode), Mode 2 (bidirectional mode), and Mode 3 (control mode). The mode numbers are assigned for mnemonic significance: 0 = Out, 1 = In, 2 = Bidirectional. Port B cannot operate in Mode 2. The mode of operation must be established by writing a control word to the PIO in the following format: Listed in Table 1, Bits D7 and D6 form the binary code that designate mode of operation: Bits D5 and D4 are ignored. Bits D3-D0 must be set to 1111 to indicate Set Mode. Selecting Mode 0 enables any data written to the port output register by the CPU to be enabled onto the port data bus. The output register contents may be changed by writing a new data word to the port. Also, the current contents of the output register may be read back to the Z80 CPU by executing an input instruction. When Mode 0 is active, a data write from the CPU causes the port’s Ready handshake line to go High, thereby notifying the peripheral that Table 1. PIO Mode Selection D7 D6 Mode 0 0 0 (output) 0 1 1 (input) 1 0 2 (bidirectional) 11 3 (control) Mode Word M1 M0 X X Signifies Mode Word to be Set D7 D6 D5 D4 D3 D0 D2 D1 11 1 1 |
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