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PC312XDP512F0CFVR Datasheet(PDF) 641 Page - Freescale Semiconductor, Inc

Part # PC312XDP512F0CFVR
Description  HCS12X Microcontrollers
PDF  1348 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC312XDP512F0CFVR Datasheet(HTML) 641 Page - Freescale Semiconductor, Inc

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Chapter 17 Memory Mapping Control (S12XMMCV2)
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor
641
The following conditions must be satisfied to ensure correct operation of the RAM protection mechanism:
•
Value stored in RAMXGU must be lower than the value stored in RAMSHL.
•
Value stored RAMSHL must be lower or equal than the value stored in RAMSHU.
Figure 17-25. RAM Write Protection Scheme
Table 17-21. RAM Write Protection Interrupt Vectors
Interrupt Source
CCR Mask
Local Enable
CPU access violation
I Bit
AVIE in RAMWPC
$0F_FFFF
$00_0000
Shared Region
XGATE RAM
Region
$0F_RAMSHU_FF
$0F_RAMSHL_00
$0F_RAMXGU_FF
Only XGATE is allowed to write
CPU and XGATE are allowed to write
Only CPU is allowed to write
Unimplemented
Only CPU is allowed to write
$00_0800
2K Registers



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