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Chapter 3: System Peripherals
3 Chapter 3: System Peripherals
3.1 Outline
Now that we have some familiarity with the ARM9 core and the necessary development tools we can begin to
look at the STR9 device itself. In this section we will concentrate on the system peripherals, that is to say the
features which are used to control the performance and functional features of the device. This includes the onchip FLASH and SRAM memory, clock and power control subsystem and the on-chip DMA control units. Finally
we will take a look at the STR9 interrupt structure and the advanced support provided by ST to supplement the
two CPU interrupt lines IRQ and FIQ. This is a key chapter in understanding how ST have integrated the ARM9
CPU into a standard microcontroller architecture.
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