Datasheet

Chapter 24 128 KByte Flash Module (S12XFTM128K2V1)
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor 885
24.4.2.21 Partition D-Flash Command
The Partition D-Flash command allows the user to allocate sectors within the D-Flash block for
applications and a partition within the buffer RAM for EEPROM access. The D-Flash block consists of 32
sectors with 256 bytes per sector. The Erase All Blocks command must be run prior to launching the
Partition D-Flash command.
Upon clearing CCIF to launch the Partition D-Flash command, the following actions are taken to define a
partition within the D-Flash block for direct access (DFPART) and a partition within the buffer RAM for
EEE use (ERPART):
• Validate the DFPART and ERPART values provided:
— DFPART <= 128 (maximum number of 256 byte sectors in D-Flash block)
— ERPART <= 8 (maximum number of 256 byte sectors in buffer RAM)
— If ERPART > 0, 128 - DFPART >= 12 (minimum number of 256 byte sectors in the D-Flash
block required to support EEE)
— If ERPART > 0, ((128-DFPART)/ERPART) >= 8 (minimum ratio of D-Flash EEE space to
buffer RAM EEE space to support EEE)
• Erase verify the D-Flash block and the EEE nonvolatile information register
• Program DFPART to the EEE nonvolatile information register at global address 0x12_0000 (see
Table 24-7)
• Program a duplicate DFPART to the EEE nonvolatile information register at global address
0x12_0002 (see Table 24-7)
Table 24-74. EEPROM Emulation Query Command Error Handling
Register Error Bit Error Condition
FSTAT
ACCERR
Set if CCOBIX[2:0] != 000 at command launch
Set if command not available in current mode (see Table 24-30)
FPVIOL None
MGSTAT1 None
MGSTAT0 None
FERSTAT EPVIOLIF None
Table 24-75. Partition D-Flash Command FCCOB Requirements
CCOBIX[2:0] FCCOB Parameters
000 0x20 Not required
001 Number of 256 byte sectors for the D-Flash user partition (DFPART)
010 Number of 256 byte sectors for buffer RAM EEE partition (ERPART)