PXS20RM Datasheet, PDF (975/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Memory Protection Unit (MPU)
This simple example is intended to show one possible application of the capabilities of the Memory
Protection Unit in a typical system.
Table 30-12. Overlapping region descriptor example
Region description
CP0 code
CP1 code
CP0 data and stack
CP0  CP1 shared data
CP1  CP0 shared data
CP1 data and stack
Shared DMA data
MPU
Peripherals
RGDn
CP0
0
rwx
1
r--
2
rw-
3
r--
4
---
5
rw-
6
rw-
7
rw-
CP1
DMA1
DMA2 System space
r--
--
rwx
--
---
--
r--
--
--
Flash memory
--
--
SRAM
--
rw-
--
--
rw-
rw
rw
rw-
--
--
IPS
rw-
rw
--
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
30-21