Z80 CMOS Microprocessors
Z84C90 KIO Serial/
Parallel Counter/Timer
Product Specification
PS011804-0612
Copyright ©2012 Zilog, Inc. All rights reserved.
www.zilog.com
Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
ii
Warning:
DO NOT USE THIS PRODUCT IN LIFE SUPPORT SYSTEMS.
LIFE SUPPORT POLICY
ZILOG’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE
SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF
THE PRESIDENT AND GENERAL COUNSEL OF ZILOG CORPORATION.
AS USED HEREIN
Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b)
support or sustain life and whose failure to perform when properly used in accordance with instructions for
use provided in the labeling can be reasonably expected to result in a significant injury to the user. A
critical component is any component in a life support device or system whose failure to perform can be
reasonably expected to cause the failure of the life support device or system or to affect its safety or
effectiveness.
DOCUMENT DISCLAIMER
©2012 Zilog, Inc All rights reserved. Information in this publication concerning the devices, applications,
or technology described is intended to suggest possible uses and may be superseded. ZILOG, INC. DOES
NOT ASSUME LIABILITY FOR OR PROVIDE A REPRESENTATION OF ACCURACY OF THE
INFORMATION, DEVICES, OR TECHNOLOGY DESCRIBED IN THIS DOCUMENT. ZILOG ALSO
DOES NOT ASSUME LIABILITY FOR INTELLECTUAL PROPERTY INFRINGEMENT RELATED
IN ANY MANNER TO USE OF INFORMATION, DEVICES, OR TECHNOLOGY DESCRIBED
HEREIN OR OTHERWISE. The information contained within this document has been verified according
to the general principles of electrical and mechanical engineering.
ZMOTION, Z8 Encore! XP and eZ8 are trademarks or registered trademarks of Zilog, Inc. (An IXYS
Company). All other product or service names are the property of their respective owners.
PS011804-0612
Life Support Policy
Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
iii
Revision History
Each instance in the following revision history table reflects a change to this document
from its previous version. For more details, refer to the corresponding pages or appropriate
links provided in the table.
Revision
Level
Description
04
03
02
Corrected to remove internal discussion tags.
Updated to include missing information covered in the
DC8321-00 Databook (2Q94).
Added
Z84C90 KIO Peripheral: Serial/Parallel Counter/
Timer Packages
table, modified
AC Characteristics of the
Z84C90
table.
Original issue.
Page
Number
N/A
All
2, 38
Date
Jun
2013
Jun
2012
Sep
2002
Sep
2002
01
All
PS011804-0612
Revision History
Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
iv
Table of Contents
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Block Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Register Address Decoding for the KIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Register Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PIO Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTC Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SIO Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PIA Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
KIO Command Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Z84C90 KIO: Enhanced Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Test Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
13
16
16
18
20
26
27
27
29
29
29
30
37
37
Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Part Number Suffix Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Precautions & Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Customer Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
PS011804-0612
Table of Contents
Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
v
List of Figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
A Block Diagram of the Z84C90 KIO Peripheral . . . . . . . . . . . . . . . . . . . . . 2
Z84C20 Parallel Input/Output Block Diagram . . . . . . . . . . . . . . . . . . . . . . . 3
Parallel Interface Adapter Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Counter/Timer Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SIO Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Crystal Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Z84C90 84-Pin PLCC Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
100-Pin LQFP Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
KIO Register Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 10. PIO Interrupt Vector Word Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 11. PIO Mode Control Word Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 12. PIO I/O Register Control Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 13. PIO Interrupt Control Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 14. PIO Mask Control Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 15. PIO Interrupt Disable Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 16. CTC Channel Control Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 17. CTC Time Constant Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 18. CTC Interrupt Vector Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 19. SIO Read Register 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 20. SIO Read Register 1** . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 21. SIO Read Register 2 (Channel B only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 22. SIO Write Register 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 23. SIO Write Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 24. SIO Write Register 2 (Channel B only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 25. SIO Write Register 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 26. SIO Write Register 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 27. SIO Write Register 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 28. SIO Write Register 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
PS011804-0612
List of Figures
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