2.5.2.3 Behavior of Memory Accesses

The following table provides information about the behavior of accesses to each region in the memory map.

Table 2-11. Memory Access Behavior
Address range	Memory region	Memory Type¹	XN¹	Description
0x00000000- 0x1FFFFFFF	Code	Normal	—	Executable region for program code. You can also put data here.
0x20000000- 0x3FFFFFFF	SRAM	Normal	—	Executable region for data. You can also put code here. This region includes bit band and bit band alias areas, see Table 2-13.
0x40000000- 0x5FFFFFFF	Peripheral	Device	XN	This region includes bit band and bit band alias areas, see Table 2-14.
0x60000000- 0x9FFFFFFF	External RAM	Normal	—	Executable region for data.
0xA0000000- 0xDFFFFFFF	External device	Device	XN	External Device memory.
0xE0000000- 0xE00FFFFF	Private Peripheral Bus	Strongly- ordered	XN	This region includes the NVIC, System timer, and system control block.
0xE0100000- 0xFFFFFFFF	Vendor specific	Device	XN	Accesses to this region are to vendor-specific peripherals.

Note:

See Memory Regions, Types and Attributes for more information.

The Code, SRAM, and external RAM regions can hold programs. However, Arm recommends that programs always use the Code region. This is because the processor has separate buses that enable instruction fetches and data accesses to occur simultaneously.

The MPU can override the default memory access behavior described in this section. For more information, see Memory Protection Unit.