4. • ARM 32-bit Cortex™-M4 CPU with FPU
• frequency up to 168 MHz
• Up to 3 × I2C interfaces
• Up to 3 SPIs (37.5 Mbits/s)
• Price: $8.6
ST STM32F405
5. • ARM Cortex-M4 processor, running at
frequencies of up to 204 MHz
• Hardware floating-point unit
• ARM Cortex-M0 co-processor
• Two I2C-bus interfaces
• One SPI controller, Two SSP controllers
• Price: $8.8
NXP LPC4330