Control device for an automatic vending machine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 8, 1988
Grant Date -
N/A
app pub date -
Mar 4, 1987
filing date -
Mar 4, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Control apparatus and method is disclosed for a processor controlled vending machine. The control device includes a trigger signal generating circuit for periodically generating a trigger signal. The processor is responsive to the trigger signal to compare the value of the program counter and stack pointer to predetermined limits. If the value of the program counter and stack pointer is within a predetermined range (i.e., the values of the program counter and stack pointer is within the predetermined limits) then the processor does not determine that a vending machine malfunction has occurred. If, however, the value of the stack pointer or the program counter is not within the predetermined range, then the processor determines that a malfunction has occurred and provides a port signal. A reset signal generating circuit is responsive to the port signal to provide a reset signal, which reset signal is used to reset the mechanical and electronic systems of the vending machine.
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