At present, the common ARMs in the domestic market include NXP (Philips), Samsung, Atmel, TI, ADI, etc., according to user requirements and application fields. You can choose from the following aspects:

1. Speed ​​(regular application): The main clock of ARM7 is 20~133M, ARM9 is 100~233M, and ARM10 is up to 700M. If the speed requirement is higher, multi-core ARM can also be used.

2. Memory (regular application): Generally, ARM has built-in Flash (program) and SRAM (data). Atmel‘s ARM has the largest memory capacity. If you want to expand external SDRAM, Atmel, Samsung, NXP can be.

3. MCU upgrade (regular application): If you are upgrading from the original MCU system (speed, GPIO, etc.), you can choose NXP‘s ARM. The company‘s ARM is the most cost-effective, and some models can be purchased within 30 yuan, and there are weekly Ligong MCU technical support, rich development tools and technical data.

4. USB interface (special application): Various ARMs of Samsung have built-in USB2.0 Host/Device interfaces, and NXP‘s ARMs also have built-in USB2.0 (full-speed) interfaces.

5. AD/DA (data acquisition, industrial control): ADI mainly produces analog chips, so the company‘s ARM chips basically have built-in AD and DA, and the number of digits, speed, and speed are the best.

6. Ethernet (embedded WEB, Modem): Samsung and Atmel have built-in Ethernet controllers from various ARMs, and some ARMs of NXP also have them.

7. DSP (signal processing): TI‘s DSP is the most famous, so the company‘s ARM has a built-in DSP processor; Motorola‘s ARM also has a built-in DSP.

8. Audio/video interface (audio/video equipment): There is no doubt that Philips‘ ARM, such as SAA7750, should be selected in this regard.

9. FPGA (complex logic circuit): Altera specializes in EPLD/FPGA. The company‘s ARM has a built-in FPGA, such as EPXA1, EPXA4, and EPXA10. The number of gates in the built-in FPGA is 100K, 400K, and 1000K, respectively.

10. Cortex-M3 (the latest ARM core, high cost performance): ST‘s STM32 series, NXP‘s LPC13xx series and TI‘s LM3S series are more popular in China. Among them, STM32 is the most popular and takes the lead.