7-1
CIRCUIT DESCRIPTION
TABLE OF CONTENTS
Page
1. Block Diagram ........................................................................................................................ 7-2
2. Power Circuit .......................................................................................................................... 7-3
2.1 Power Input....................................................................................................................... 7-3
2.2 DC to DC Circuit................................................................................................................ 7-3
2.3 Panel Vcc Control ............................................................................................................. 7-3
3. Microprocessor Control Circuit ...............................................................................................7-3
3.1 Clock Circuit...................................................................................................................... 7-3
3.2 I
2
C Buses .......................................................................................................................... 7-3
3.3 General-purpose Port........................................................................................................7-3
3.3.1 Key Scan Status ......................................................................................................... 7-3
3.3.2 Scalar Control............................................................................................................. 7-4
3.3.3 Led Control................................................................................................................. 7-4
3.3.4 Data Memory.............................................................................................................. 7-4
4. Scalar...................................................................................................................................... 7-4
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