Datasheet

6289CS–ATARM–28-May-09

AT91SAM9R64/RL64

9. System Controller

The System Controller is a set of peripherals, which allow handling of key elements of the sys-

tem, such as power, resets, clocks, time, interrupts, watchdog, etc.

The System Controller User Interface embeds also the registers allowing to configure the Matrix

and a set of registers configuring the EBI chip select assignment and the voltage range for exter-

nal memories.

9.1 System Controller Mapping

As shown in Figure 8-1, the System Controller’s peripherals are all mapped within the highest

16K bytes of the 4 Gbyte address space, between addresses 0xFFFF C000 and 0xFFFF FFFF.

However, all the registers of System Controller are mapped on the top of the address space.

This allows addressing all the registers of the System Controller from a single pointer by using

the standard ARM instruction set, as the Load/Store instruction have an indexing mode of +/-

4kbytes.