MICROCONTROLLER AND ITS CONTROL METHOD

MICROCONTROLLER AND ITS CONTROL METHOD

PROBLEM TO BE SOLVED: To reduce power consumption and complexity of program development.SOLUTION: A microcontroller 100 has a RAM control unit 107 which performs a RAM access operation when an address specified by a CPU 103 is within a specified area 155, and reads out a program from a flash EEPROM...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: MIYAKE JIRO, ODAWARA HIROYUKI
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To reduce power consumption and complexity of program development.SOLUTION: A microcontroller 100 has a RAM control unit 107 which performs a RAM access operation when an address specified by a CPU 103 is within a specified area 155, and reads out a program from a flash EEPROM 101 when the address is not within the specified area 155. The RAM access operation of the RAM control unit 107 reads out a program from the flash EEPROM 101 when a valid bit 171 is in the invalid state and stores the program in a RAM 102, changing the status of the valid bit 171 to valid. When the valid bit 171 is in the valid state, the program stored in the RAM 102 is output to the CPU 103.