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Installation and Operation
FIGURE 2-6:
PIC16F877 FIRMWARE FLOW - VENDING MACHINE
Vending Machine Routine
Display Soda and
Candy Information
Switch
SW2 or SW3 Yes
Depressed?
No
Data
Byte
Received from
Primary
Yes
Which
Switch is
Depressed?
SW3
Device?
No
SW2
Increment Soda Counter
Increment Candy Counter
Data
Byte
Yes
= 0x35 ?
Transmit Data to
? 2004 Microchip Technology Inc.
No
Data
Byte
= 0x36 ?
No
Yes
Clear Soda and Candy
Counter Values
Primary Device
DS51516A-page 19
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