Static information storage and retrieval – Floating gate
Reexamination Certificate
2000-07-25
2001-04-24
Le, Vu A. (Department: 2824)
Static information storage and retrieval
Floating gate
C365S189050, C365S230060, C365S230080
Reexamination Certificate
active
06222760
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to micro-controllers, and more particularly to an OTP (One Time Programmable) micro-controller which uses limited data input/output pins to achieve big volume data input/output within a unit time, so as to improve programming speed.
A regular programmable micro-controller writes data in its internal memory or reads out data from its internal memory through the respective input/output pins by means of one-to-one mode, i.e., for 7-bit input data, the micro-controller must have 7 pins connected to its internal memory so that synchronous write-in action can be achieved. For input data of bit number greater than the number of the data input/output pins of the micro-controller, the data cannot be write in the internal memory at one time, i.e., the data must be write in the internal memory at two times, resulting in low programming speed. If increasing the number of input/output pins of the internal memory, the internal circuit design of the micro-controller must be modified, and the cost will be greatly increased.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a micro-controller, which uses limited input/output pins to achieve great bit number data programming operation, so as to improve data programming speed. According to the present invention, a high-data/low-data switching unit is used in the OTP (One Time Programmable) micro-controller to separate input data into high-data and low-data for transmission to an EPROM (erasable programmable read only memory), so that input data of bit number greater than the number of data input/output pins of the micro-controller can be positively write in the EPROM at one time.
REFERENCES:
patent: 4860260 (1989-08-01), Saito et al.
patent: 5239505 (1993-08-01), Fazio et al.
patent: 6128231 (2000-10-01), Chung
Casey Donald C.
Le Vu A.
Micon Design Technology Co. LTD
Nguyen Tuan T.
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