Information

• Byte 1 data is expected at byte address start + 0b01,
• Byte 2 data is expected at byte address start + 0b10, and
• Byte 3 data is expected at byte address start + 0b11.
NOTE
See the description of margin reads, Margin Read Commands
Table 28-40. Margin Level Choices for Program Check
Read Margin Choice Margin Level Description
0x01 Read at 'User' margin-1 and 'User' margin-0
0x02 Read at 'Factory' margin-1 and 'Factory' margin-0
Table 28-41. Program Check Command Error Handling
Error Condition Error Bit
Command not available in current mode/security FSTAT[ACCERR]
An invalid flash address is supplied FSTAT[ACCERR]
Flash address is not longword aligned FSTAT[ACCERR]
An invalid margin choice is supplied FSTAT[ACCERR]
Either of the margin reads does not match the expected data FSTAT[MGSTAT0]
28.4.11.4 Read Resource Command
The Read Resource command allows the user to read data from special-purpose memory
resources located within the flash memory module. The special-purpose memory
resources available include program flash IFR space, data flash IFR space, and the
Version ID field. Each resource is assigned a select code as shown in Table 28-43.
Table 28-42. Read Resource Command FCCOB Requirements
FCCOB Number FCCOB Contents [7:0]
0 0x03 (RDRSRC)
1 Flash address [23:16]
2 Flash address [15:8]
3 Flash address [7:0]
1
Returned Values
4 Read Data [31:24]
5 Read Data [23:16]
6 Read Data [15:8]
7 Read Data [7:0]
Table continues on the next page...
Flash Operation in Low-Power Modes
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
538 Freescale Semiconductor, Inc.