NXP (NXP Semiconductors) is a newly independent semiconductor company founded by Philips and has a long history of more than 50 years. It provides engineers and designers with various semiconductor products and software for mobile communications, consumer electronics, and security. Apps, contactless payment and connection, and in-car entertainment and networking products provide a better perceived experience.
NXP Semiconductors offers High Performance Mixed Signal and standard product solutions with its leading RF, analog, power management, interface, security and digital processing expertise. These innovative products and solutions can be widely used in automotive, smart identification, wireless infrastructure, lighting, industrial, mobile, consumer, and computing.
This article mainly introduces the NXP LPC series ARM chip ISP write program, first come to understand what products NXP ARM.
Cortex-M0 LPC1100 Series
Cortex-M3 LPC1300 Series
Cortex-M4 Series
ARM7 LPC2100 Series
ARM7 LPC2200 Series
ARM7 LPC2300 Series
ARM7 LPC2400 Series
NXP's LPC series ARM chip program is written to support J-LINK and ISP. J-LINK is generally used for online simulation, program debugging, can be single-step operation, more intuitive and easy to find logic errors in the program. This method needs to be connected to a J-LINK emulator, which has a relatively high price, and is mainly used for debugging during program development. The ISP generally programs the internal program memory through the serial interface of the single-chip microcomputer. This method is easy to program and the cost of the interface circuit is low, but it requires the support of the upper computer software. This method is suitable for mass production. The longest used PC software is flash magic. This software is an upper computer software that NXP (NXP) company supports for ISP programming to facilitate the programming of the company's LPC series microcontrollers.
Below is a brief explanation of personally understood ISP downloads. ISP downloads mainly include the following ports: RX, TX, ISP, and power supply (VCC and GND). The power supply is mainly to supply power to the serial porting board. The power supply is provided by the target circuit board. The serial porting board is an RS232 circuit. Generally, the RS232 chip is used. Most of the chips are 5V power supply, so the target board needs to provide 5V to burn. Write board, under normal circumstances 3.3 RS voltage RS232 chip can work, but the work is not stable, there will be communication failures, so I do not recommend the use of 3.3V voltage to power the burning board.
The RX end of the programming board needs to be connected to the TX end of the target board, and the TX end of the programming board needs to be connected to the RX end of the target board. VCC and GND are connected to the power supply header and ground end of the programming board. The ISP can download the ISP for the board. On the signal side, when it is necessary to download the program through the ISP interface, it is necessary to pull down the pin of the chip (enable this function). After pulling down, the chip must be reset once before entering the ISP mode to download the program. Therefore, the chip needs to have a power-on reset circuit to ensure that a reset signal is generated after power-on and can normally enter the ISP mode.
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