Portable electronic apparatus with a device for determining data validity
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United States of America Patent
Stats
-
Jun 13, 1989
Grant Date -
N/A
app pub date -
Jun 18, 1987
filing date -
Jun 20, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
According to the portable electronic apparatus of the invention, when a data string is to be written in a data memory, information indicating whether the data string is valid or not is appended to the data string, and the data string is stored. When a read instruction is supplied from a portable electronic apparatus handling system, a CPU connected to the data memory appends the information, indicating validity or invalidity of the data string, to the start of the readout data string, and supplies the data string to the portable electronic apparatus handling system. When the data string supplied from the portable electronic apparatus handling system is to be written in the data memory, the CPU appends the information indicating invalidity to the data string and writes the data string, thereby updating the information indicating invalidity to information indicating validity after the completion of the data string writing.
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