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32-bit microcontroller IP. The ARM company which designs the ARM cores doesn't make controllers itself, but licences the IP to other manufacturers. ARM is the leading 32-bit controller and is available from tens of suppliers.
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STM32F429 ignoring writes to EXTI mux registers
The following code is at the start of my main() function:
SystemInit();
SystemCoreClockUpdate();
SysTick_Config(168); // 1 us ticks
NVIC_SetPriority(SysTick_IRQn, 0);
RCC->AHB1ENR |= RCC_AHB1ENR_GP …