Z84C90 Datasheet, PDF (15/31 Pages) Zilog, Inc. – KIO Serial/Parallel Counter Timer

Z84C90
KIO Serial/Parallel Counter Timer
10
The Ordering Information section lists temperature ranges and product numbers. Package
drawings are in the Package Information section. Refer to the Literature List for additional
documentation.
+5V
From Output
Under Test
2.1K
100 pF
250
µA
Figure 4. Test Load Diagram
Internal
Control
Logic
Data _CPU
Bus I/O
Control
Internal Bus
Interrupt
Control
3
Interrupt Control Lines
Figure 5. PIO Block Diagram
8
Port A
I/O
Data or
Control
Handshake
8
Port B
I/O
Data or
Control
Peripheral
Interface
Handshake
PS011802-0902