Data erasing and re-writing circuit for use in microcomputer integrated circuit device
First Claim
1. A data erasing and re-writing circuit for use in a microcomputer integrated circuit device including a central processing means, comprising:
- electrically erasable and programmable read only memory,serial data transmitting means for applying external bit serial data to said read only memory, andwriting means for writing the data applied from said serial data transmitting means in said read only memory, whereinsaid bit serial data includes a start bit indicative of the start of the data, data of a plurality of bits and a stop bit indicative of the end of the data, andsaid serial data transmitting means includes serial-parallel converting means responsive to a detection of said start bit for converting said data of a plurality of bits into bit parallel data and applying the same to said read only memory.
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Accused Products
Abstract
Data in an EEPROM contained in a microcomputer integrated circuit device is erased and re-writing. Upon a detection of a start bit of the data, data of a plurality of bits is accepted in a shift register in response to a clock signal applied from a synchronization circuit. A counter counts clock signals up to the number corresponding to the data of a plurality of bits to inhibit data writing in the shift register. The data accepted in the shift register is temporarily stored as bit parallel data of a plurality of bits in a receiving buffer and selected by a selector to be applied to the EEPROM. The data is written, by a write control circuit, at an address in the EEPROM designated by an address counter.
37 Citations
6 Claims
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1. A data erasing and re-writing circuit for use in a microcomputer integrated circuit device including a central processing means, comprising:
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electrically erasable and programmable read only memory, serial data transmitting means for applying external bit serial data to said read only memory, and writing means for writing the data applied from said serial data transmitting means in said read only memory, wherein said bit serial data includes a start bit indicative of the start of the data, data of a plurality of bits and a stop bit indicative of the end of the data, and said serial data transmitting means includes serial-parallel converting means responsive to a detection of said start bit for converting said data of a plurality of bits into bit parallel data and applying the same to said read only memory. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification