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CAUTION
A flash memory location must be in the erased state before
being programmed. Cumulative programming of bits (back-to-
back program operations without an intervening erase) within a
flash memory location is not allowed. Re-programming of
existing 0s to 0 is not allowed as this overstresses the device.
Table 28-46. Program Longword Command FCCOB Requirements
FCCOB Number FCCOB Contents [7:0]
0 0x06 (PGM4)
1 Flash address [23:16]
2 Flash address [15:8]
3 Flash address [7:0]
1
4 Byte 0 program value
5 Byte 1 program value
6 Byte 2 program value
7 Byte 3 program value
1. Must be longword aligned (Flash address [1:0] = 00).
Upon clearing CCIF to launch the Program Longword command, the flash memory
module programs the data bytes into the flash using the supplied address. The targeted
flash locations must be currently unprotected (see the description of the FPROT and
FDPROT registers) to permit execution of the Program Longword operation.
The programming operation is unidirectional. It can only move NVM bits from the erased
state ('1') to the programmed state ('0'). Erased bits that fail to program to the '0' state are
flagged as errors in MGSTAT0. The CCIF flag is set after the Program Longword
operation completes.
The supplied address must be longword aligned (flash address [1:0] = 00):
• Byte 0 data is written to the supplied address ('start'),
• Byte 1 data is programmed to byte address start+0b01,
• Byte 2 data is programmed to byte address start+0b10, and
• Byte 3 data is programmed to byte address start+0b11.
Table 28-47. Program Longword 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]
Flash address points to a protected area FSTAT[FPVIOL]
Table continues on the next page...
Chapter 28 Flash Memory Module (FTFL)
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
623
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