mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 260

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

Chapter 8 256 KByte Flash Module (S12XFTM256K2XFV1)
8.4.2.4
The Read Once command provides read access to a reserved 64 byte field (8 phrases) located in the
nonvolatile information register of P-Flash block 0. The Read Once field is programmed using the
Program Once command described in
from the Flash block containing the Program Once reserved field to avoid code runaway.
Upon clearing CCIF to launch the Read Once command, a Read Once phrase is fetched and stored in the
FCCOB indexed register. The CCIF flag will set after the Read Once operation has completed. Valid
phrase index values for the Read Once command range from 0x0000 to 0x0007. During execution of the
Read Once command, any attempt to read addresses within P-Flash block 0 will return invalid data.
8.4.2.5
The Program P-Flash operation will program a previously erased phrase in the P-Flash memory using an
embedded algorithm.
260
128
1. As defined by the memory map for FTM512K3.
2. As found in the memory map for FTM512K3.
FERSTAT
Register
FSTAT
Read Once Command
Program P-Flash Command
CCOBIX[2:0]
MGSTAT1
MGSTAT0
EPVIOLIF
ACCERR
Error Bit
FPVIOL
000
001
010
011
100
101
Table 8-39. Read Once Command FCCOB Requirements
Table 8-40. Read Once Command Error Handling
MC9S12XF - Family Reference Manual, Rev.1.19
Set if CCOBIX[2:0] != 001 at command launch
Set if command not available in current mode (see
Set if an invalid phrase index is supplied
None
Set if any errors have been encountered during the read
Set if any non-correctable errors have been encountered during the read
None
Section
Read Once phrase index (0x0000 - 0x0007)
0x04
8.4.2.6. The Read Once command must not be executed
Read Once word 0 value
Read Once word 1 value
Read Once word 2 value
Read Once word 3 value
FCCOB Parameters
Error Condition
Not Required
Table
8-30)
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