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S912XEP100J5MAG Datasheet, PDF (189/1324 Pages) Freescale Semiconductor, Inc – Features of the MC9S12XE-Family are listed here. Please see Table D-2.for memory options and Table D-2. for the peripheral features that are available on the different family members. | |||
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Chapter 3 Memory Mapping Control (S12XMMCV4)
⢠Simultaneous accesses to different resources1 (internal, external, and peripherals) (see Figure 3-1 )
⢠Resolution of target bus access collision
⢠MCU operation mode control
⢠MCU security control
⢠Separate memory map schemes for each master CPU, BDM and XGATE
⢠ROM control bits to enable the on-chip FLASH or ROM selection
⢠Port replacement registers access control
⢠Generation of system reset when CPU accesses an unimplemented address (i.e., an address which
does not belong to any of the on-chip modules) in single-chip modes
3.1.3 S12X Memory Mapping
The S12X architecture implements a number of memory mapping schemes including
⢠a CPU 8 MByte global map, deï¬ned using a global page (GPAGE) register and dedicated 23-bit
address load/store instructions.
⢠a BDM 8 MByte global map, deï¬ned using a global page (BDMGPR) register and dedicated 23-
bit address load/store instructions.
⢠a (CPU or BDM) 64 KByte local map, deï¬ned using speciï¬c resource page (RPAGE, EPAGE and
PPAGE) registers and the default instruction set. The 64 KBytes visible at any instant can be
considered as the local map accessed by the 16-bit (CPU or BDM) address.
⢠The XGATE 64 Kbyte local map.
The MMC module performs translation of the different memory mapping schemes to the speciï¬c global
(physical) memory implementation.
3.1.4 Modes of Operation
This subsection lists and brieï¬y describes all operating modes supported by the MMC.
3.1.4.1 Power Saving Modes
⢠Run mode
MMC is functional during normal run mode.
⢠Wait mode
MMC is functional during wait mode.
⢠Stop mode
MMC is inactive during stop mode.
3.1.4.2 Functional Modes
⢠Single chip modes
In normal and special single chip mode the internal memory is used. External bus is not active.
1. Resources are also called targets.
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor
189
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