Flash memory incorporating microcomputer having on-board writing function
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United States of America Patent
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Feb 16, 1999
Grant Date -
N/A
app pub date -
Nov 12, 1996
filing date -
Nov 10, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
In a microcomputer comprising internal buses, a serial communication interface, a flash memory, a RAM, a ROM for storing a writing program, an input/output port, a CPU, and a mode control unit for setting various operation modes and test modes in the microcomputer, a switching circuit is connected between the ROM and the internal buses and between the input/output port and the internal buses. The mode control unit operates the switching circuit in an emulation test mode so that the ROM is deactivated and the input/output port is activated. Then, the CPU reads a program from the serial communication interface and writes the program into the flash memory in accordance with a writing program from the input/output port.
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