mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 269

• Manufacturer Part Number: mc9s12xf512
• Description: S12x Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

8.4.2.14
The Full 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
128 sectors with 256 bytes per sector.
Upon clearing CCIF to launch the Full 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):
The D-Flash user partition will start at global address 0x10_0000. The buffer RAM EEE partition will end
at global address 0x13_FFFF. After the Full Partition D-Flash operation has completed, the CCIF flag will
set.
Running the Full Partition D-Flash command a second time will result in the previous partition values and
the entire D-Flash memory being erased. The data value written corresponds to the number of 256 byte
sectors allocated for either direct D-Flash access (DFPART) or buffer RAM EEE access (ERPART).
Freescale Semiconductor
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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
— If ERPART > 0, ((128-DFPART)/ERPART) >= 8 (minimum ratio of D-Flash EEE space to
Erase 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
Program a duplicate DFPART to the EEE nonvolatile information register at global address
0x12_0002 (see
Program ERPART to the EEE nonvolatile information register at global address 0x12_0004 (see
Table
Program a duplicate ERPART to the EEE nonvolatile information register at global address
0x12_0006 (see
block required to support EEE)
buffer RAM EEE space to support EEE)
Full Partition D-Flash Command
8-7)
8-7)
CCOBIX[2:0]
Table 8-61. Full Partition D-Flash Command FCCOB Requirements
000
001
010
Table
Table
8-7)
8-7)
Number of 256 byte sectors for the D-Flash user partition (DFPART)
Number of 256 byte sectors for buffer RAM EEE partition (ERPART)
MC9S12XF - Family Reference Manual, Rev.1.19
0x0F
FCCOB Parameters
Chapter 8 256 KByte Flash Module (S12XFTM256K2XFV1)
Not required
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