O'Reilly logo

The Definitive Guide to the ARM Cortex-M3 by Joseph Yiu

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

CHAPTER 14 Other Cortex-M3 Features

The SYSTICK Timer

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.

image

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 ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required