S912XEG128J2MAA Datasheet, PDF (229/1324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 4 Memory Protection Unit (S12XMPUV1)
• Each descriptor can be configured to allow one of four types of access privilege for the defined
memory region
— Bus master has full access (read, write and execute enabled)
— Bus master can read and execute (write illegal)
— Bus master can read and write (execution illegal)
— Bus master can only read (write and execution illegal)
• Accesses to memory not covered by any protection descriptor will cause an access violation
4.1.4 Modes of Operation
The MPU module can be used in all MCU modes.
4.2 External Signal Description
The MPU module has no external signals.
4.3 Memory Map and Register Definition
This section provides a detailed description of address space and registers used by the MPU module.
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor
229