Z84C90_12 Datasheet, PDF (12/56 Pages) Zilog, Inc. – KIO Serial/Parallel Counter/Timer

Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
5
Data
8
Control
6
CPU
Bus
I/O
Internal Bus
Internal
Control
Logic
INT
Interrupt
Logic
IE1
IE0
Counter/
Timer
Logic
4 ZC/TO
4 CLK/TRG
Reset
Figure 4. Counter/Timer Block Diagram
Serial I/O Logic Unit. This logic unit provides the user with two separate serial I/O chan-
nels that are completely compatible with the Z84C4x SIO (see Figure 5). Their basic func-
tions as serial-to-parallel and parallel-to-serial converters can be programmed by a CPU
for a broad range of serial communications applications. Each channel, designated Chan-
nel A and Channel B, is capable of supporting all common asynchronous and synchronous
protocols (Monosync, Bisync and SDLC/HDLC), byte- or bit-oriented.
PS011804-0612
Block Descriptions