Datasheet

Memory Mapping Control (S12XMMCV4)
S12XS Family Reference Manual, Rev. 1.13
128 Freescale Semiconductor
3.1.1 Terminology
3.1.2 Features
The main features of this block are:
• Paging capability to support a global 8MB memory address space
• Bus arbitration between the masters CPU, BDM
• Simultaneous accesses to different resources
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(internal, 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
• ROM control bits to enable the on-chip FLASH or ROM selection
• 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
Table 3-1. Acronyms and Abbreviations
Logic level “1” Voltage that corresponds to Boolean true state
Logic level “0” Voltage that corresponds to Boolean false state
0x Represents hexadecimal number
x Represents logic level ’don’t care’
Byte 8-bit data
word 16-bit data
local address based on the 64KB Memory Space (16-bit address)
global address based on the 8MB Memory Space (23-bit address)
Aligned address Address on even boundary
Mis-aligned address Address on odd boundary
Bus Clock System Clock. Refer to CRG Block Guide.
single-chip modes
Normal Single-Chip Mode
Special Single-Chip Mode
normal modes
Normal Single-Chip Mode
special modes
Special Single-Chip Mode
NS Normal Single-Chip Mode
SS Special Single-Chip Mode
Unimplemented areas Areas which are accessible by the pages (RPAGE,PPAGE,EPAGE) and not implemented
PRR Port Replacement Registers
PRU Port Replacement Unit located on the emulator side
MCU MicroController Unit
NVM Non-volatile Memory; Flash, Data FLASH or ROM
IFR Information Row sector located on the top of NVM. For Test purposes.
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Resources are also called targets.