MCU system and burning method capable of correcting OTP (One Time Programmable) burning problem

Abstract

The invention discloses an MCU system and a burning method capable of correcting an OTP (One Time Programmable) burning problem; the MCU system comprises an MCU and an instruction register; a multiplex data selector MUX, an address register group and a digital register group are arranged in the MCU; the OTP is connected to the address register group and the digital register group via the multiplex data selector MUX; an address comparator circuit is connected to the address register group, and is used for comparing address values in the address register group and a PC; and meanwhile, a rewriting area is arranged in the OTP, and is used for storing the address and data of the OTP in need of re-burning. According to the system and the method disclosed by the invention, the burning yield of the OTP can be improved, the burning quality can be improved, and the waste can be reduced.

Description

technical field [0001] The invention belongs to the technical field of chip programming, and in particular relates to a system and method for using an MCU to perform OTP programming. Background technique [0002] The program memory of MCU has MASK, OTP, FLASH and other types. Among them, because MASK can only determine the program when the wafer is manufactured, it will bring inconvenience to the user to modify the program. Although the MCU of FLASH or EEPROM type can be programmed multiple times, the production process is relatively complicated and the cost is high. At the same time, the yield rate of FLASH memory is generally lower than that of OTP type memory. OTP (One Time Programmable) type MCU can be programmed according to the customer's design, and the price is more advantageous than FLASH or EEPROM, and is widely used in many fields such as toys, small household appliances, and LED light control. However, the OTP type MCU can only be programmed once, so when a pro...

AI Technical Summary

Problems solved by technology

However, the OTP type MCU can only be programmed once, so when there is a programming problem, the product can only be scrapped, causing a large loss

[0003] At present, there are two factors that mainly affect the poor programming of OTP. The first is because of the interference of the power supply, especially the interference of the programming power supply, which will cause the OTP to be prone to insufficient voltage, resulting in insufficient charge injection during programming, so that the written The data is not stable enough and easy to lose, or the power supply interference causes the voltage to be too high, which leads to the problem of injecting charge at the position of the data that is not written in the OTP due to the high voltage.

The second is the interference of the data line. When the communication process is due to poor contact and other reasons, the data reception error is caused, and the programming error occurs.

This method also achieves the purpose of improving the burning effect by adjusting and controlling the burning parameters of the LCD. However, this method can only adjust the burning object before burning. can't solve

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