Datasheet

Chapter 29 1024 KByte Flash Module (S12XFTM1024K5V2)

MC9S12XE-Family Reference Manual Rev. 1.25

Freescale Semiconductor 1195

29.4.2.22 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

128 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 <= 16 (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 29-7)

Table 29-76. EEPROM Emulation Query Command Error Handling

FSTAT

ACCERR

Set if CCOBIX[2:0] != 000 at command launch

Set if a Load Data Field command sequence is currently active

Set if command not available in current mode (see Table 29-30)

FPVIOL None

MGSTAT1 None

MGSTAT0 None

FERSTAT EPVIOLIF None

Table 29-77. 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)