Information

Table 28-38. Read Resource Command Error Handling (continued)
Error Condition Error Bit
Flash address is out-of-range for the targeted resource. FSTAT[ACCERR]
Flash address is not longword aligned FSTAT[ACCERR]
28.4.10.5 Program Longword Command
The Program Longword command programs four previously-erased bytes in the program
flash memory using an embedded algorithm.
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 28-39. 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 FTFL programs the
data bytes into the flash using the supplied address. The swap indicator address in each
program flash block is implicitly protected from programming. The targeted flash
locations must be currently unprotected (see the description of the FPROT 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.
Chapter 28 Flash Memory Module (FTFL)
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc. 631