Chapter 21 64 KB Flash Module (S12ZFTMRZ64K2KV2)
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
726
Freescale Semiconductor
Upon clearing CCIF to launch the Program P-Flash command, the Memory Controller will program the
data words to the supplied global address and will then proceed to verify the data words read back as
expected. The CCIF flag will set after the Program P-Flash operation has completed.
21.4.7.6
Program Once Command
The Program Once command restricts programming to a reserved 64 byte field (8 phrases) in the
nonvolatile information register located in P-Flash. The Program Once reserved field can be read using the
Read Once command as described in
. The Program Once command must only be issued
once since the nonvolatile information register in P-Flash cannot be erased. The Program Once command
must not be executed from the Flash block containing the Program Once reserved field to avoid code
runaway.
Upon clearing CCIF to launch the Program Once command, the Memory Controller first verifies that the
selected phrase is erased. If erased, then the selected phrase will be programmed and then verified with
read back. The CCIF flag will remain clear, setting only after the Program Once operation has completed.
The reserved nonvolatile information register accessed by the Program Once command cannot be erased
and any attempt to program one of these phrases a second time will not be allowed. Valid phrase index
values for the Program Once command range from 0x0000 to 0x0007. During execution of the Program
Once command, any attempt to read addresses within P-Flash will return invalid data.
Table 21-42. Program P-Flash Command Error Handling
Register
Error Bit
Error Condition
FSTAT
ACCERR
Set if CCOBIX[2:0] != 101 at command launch
Set if command not available in current mode (see
)
Set if an invalid global address [23:0] is supplied see
)
Set if a misaligned phrase address is supplied (global address [2:0] != 000)
FPVIOL
Set if the global address [17:0] points to a protected area
MGSTAT1
Set if any errors have been encountered during the verify operation
MGSTAT0
Set if any non-correctable errors have been encountered during the verify
operation
Table 21-43. Program Once Command FCCOB Requirements
CCOBIX[2:0]
FCCOB Parameters
FCCOB0
0x07 Not
Required
FCCOB1
Program Once phrase index (0x0000 - 0x0007)
FCCOB2
Program Once word 0 value
FCCOB3
Program Once word 1 value
FCCOB4
Program Once word 2 value
FCCOB5
Program Once word 3 value
Содержание MC9S12ZVHL32
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