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SAN3010
APPLICATION NOTE
SINGLE CHIP TELEPHONE INTERFACE FOR
KEYBOARD ENTRY VIA uC
1 Scope
This application note describes a simple interface for keyboard entry to the SA253x family via a Microcontroller. It
also includes hardware description , flowchart and a software example based on the 80Cxx - family of
Microcontrollers.
2 Key Features
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•
•
•
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only 5 outputs and 1 input required from µC for handshake to access all keys in the SA253x keyboard matrix
universal interface, not restricted to specific Microcontrollers
supports both 3V- and 5V- µCs
same hardware for all single chip telephones : SA2531/2
same software for all single chip telephones, only key labels must be replaced
Table of Contents
6 HARDWARE CONFIGURATION ......................................................................................................................................................................2
12 APPENDIX B: FLOWCHART: ........................................................................................................................................................................6
3 Other applicable documents and papers
1.
2.
3.
4.
Data Sheet SA2531, SA2532
Pin-out Comparison SA2531/2
Product Presentation
Single Chip Telephone Evolution (Apr. 16, 1996)
SAN3010
PDS038-SA2531/2-003
Rev. B
21-03-00
SAMES [ SAMES ]
