For example: STM32F107xx
STM32F107xx(SOC) = Cortex-M3 + FLASH + RAM + Clock + DMA + I/O + USART + TIMERS + SPI + I2C + CAN + ADC + DAC + FSMC + Ethernet + USB

Cortex-M3(ARM Core) = Cortex-M3 CPU + NVIC + TPIU + ETM + SWJ + DWT + ITM + FPB

Cortex-M3 CPU (CPU)(like arm7tdmi, but not the same) tear down:

• registers
  • programmable registers (Rn, PC, SP, LR, xPSR…)
  • unprogrammable registers (dedicated purpose, like Adderss register, IR, shadow regs)
• control unit (the control signal after IR decoded)
• ALU
• MAC

CPU

Cortex-M3

Basic SOC

 

STM32F107xx