Z86C03 Datasheet, PDF (99/348 Pages) Zilog, Inc. – General-Purpose Register File. Flexible I/O. Analog Inputs

Z8 CPU
User Manual
81
Read
Port
4
Input
Register
4
IBIBnnuuppffuuffeett _rr
Read
Port
4
4
To Interrupt Timer,
Handshake Logic,
or Serial I/O
Output
Data
Return
Buffer
Port
4
Input
Lines
P3₀–P3₃
Write
Port
4
OOuutptpuut t
RRReeegggisiisstetteer rr
4
OOuutptpuutt
BBuufffeferr
Port
4
Output
Lines
P3₄–P3₇
Internal
Bus
From Timer,
Handshake Logic,
or Serial I/O
Figure 44. Port 3 Block Diagram
UM001602-0904
I/O Ports