LFEBS12UB Freescale Semiconductor, LFEBS12UB Datasheet - Page 216

• Manufacturer Part Number: LFEBS12UB
• Description: KIT STUDENT LEARNING S12 DG128
• Manufacturer: Freescale Semiconductor

Specifications of LFEBS12UB

• Architecture: 8/16-bit
• Code Gen Tools Included: Code Warrior
• Silicon Manufacturer: Freescale
• Core Architecture: S12
• Core Sub-architecture: S12
• Silicon Core Number: MC9S12
• Silicon Family Name: S12D
• Kit Contents: HCS12 DG128 Learning Kit
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Chapter 3 Memory Mapping Control (S12XMMCV4)
3.4.2.4
3.4.2.4.1
The XGATE 64 Kbyte memory space allows access to internal resources only (Registers, RAM, and
FLASH). The 2 Kilobyte register address range is the same register address range as for the CPU and the
BDM module (see
XGATE can access the FLASH in single chip modes, even when the MCU is secured. In expanded modes,
XGATE can not access the FLASH when MCU is secured.
The local address of the XGATE RAM access is translated to the global RAM address range. The XGATE
shares the RAM resource with the CPU and the BDM module (see
XGATE RAM size (XGRAMSIZE) may be lower or equal to the MCU RAM size (RAMSIZE).In case of
XGATE RAM size less than 32 Kbytes (see
result in an illegal RAM access (see
The local address of the XGATE FLASH access is always translated to the global address 0x78_0800 -
0x78_7FFF.
Example 3-3.
216
Because of an order from the United States International Trade Commission, BGA-packaged product lines and partnumbers
indicated here currently are not available from Freescale for import or sale in the United States prior to September 2010
The MCU FLASHSIZE is 64 Kbytes (0x10000) and MCU RAMSIZE is 32 Kbytes (0x8000).
The XGATE RAMSIZE is 16 Kbytes (0x4000).
The space occupied by the XGATE RAM in the global address space will be:
XGATE accesses to local address range 0x0800–0x7FFF will result always in accesses to the
following FLASH block in the global address space:
The gap range in the local memory map 0x8000–0xBFFF will be translated in the global address
space:
1. XGRAMSIZE is the hexadecimal value of XGATE RAM SIZE in bytes.
XGATE Memory Map Scheme
Internal Resource
is a general example of the XGATE memory map implementation.
Bottom address: (0x10_0000 minus 0x4000) = 0x0F_C000
Top address: 0x0F_FFFF
Bottom address: 0x78_0800
Top address: 0x78_7FFF
0x0F_8000 - 0x0F_BFFF (illegal xgate access to system RAM).
Expansion of the XGATE Local Address Map
XGATE RAM
Table
3-18).
Table 3-18. XGATE Implemented Memory Space
MC9S12XE-Family Reference Manual , Rev. 1.23
XGRAM_LOW = 0x0F_0000 plus (0x1_0000 minus XGRAMSIZE)
Section 3.4.3.1, “Illegal XGATE
Figure
Example 3-3.
3-20), the gap in the xgate local memory map will
$Address
Table
Accesses)
3-18).
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(1)