CHAPTER 14 Other Cortex-M3 Features
In This Chapter:
The SYSTICK register in the NVIC was covered briefly in Chapter 8. As we saw, the SYSTICK timer is a 24-bit down counter. Once it reaches zero, the counter loads the reload value from the RELOAD register. It does not stop until the enable bit in the SYSTICK Control and Status register is cleared.
Figure 14.1 SYSTICK Registers in the NVIC
The Cortex-M3 processor allows two different clock sources for the SYSTICK counter. The first one is the core free-running clock (not from the ...