FTFA_FCCOBn field descriptions (continued)
Field Description
The following table shows a generic flash command format. The first FCCOB register, FCCOB0, always
contains the command code. This 8-bit value defines the command to be executed. The command code is
followed by the parameters required for this specific flash command, typically an address and/or data
values.
NOTE:
The command parameter table is written in terms of FCCOB Number (which is equivalent to the
byte number). This number is a reference to the FCCOB register name and is not the register
address.
FCCOB Number Typical Command Parameter Contents [7:0]
0 FCMD (a code that defines the flash command)
1 Flash address [23:16]
2 Flash address [15:8]
3 Flash address [7:0]
4 Data Byte 0
5 Data Byte 1
6 Data Byte 2
7 Data Byte 3
8 Data Byte 4
9 Data Byte 5
A Data Byte 6
B Data Byte 7
FCCOB Endianness :
The FCCOB register group uses a big endian addressing convention. For all command parameter fields
larger than 1 byte, the most significant data resides in the lowest FCCOB register number.
29.3.3.6
Program Flash Protection Registers (FTFA_FPROTn)
The FPROT registers define which program flash regions are protected from program and
erase operations. Protected flash regions cannot have their content changed; that is, these
regions cannot be programmed and cannot be erased by any flash command. Unprotected
regions can be changed by program and erase operations.
The four FPROT registers allow up to 32 protectable regions. Each bit protects a 1/32
region of the program flash memory except for memory configurations with less than 64
KB of program flash where each assigned bit protects 2 KB . For configurations with 48
KB of program flash memory or less, FPROT0 is not used. For configurations with 32
KB of program flash memory or less, FPROT1 is not used. For configurations with 16
KB of program flash memory, FPROT2 is not used. The bitfields are defined in each
register as follows:
Memory Map and Registers
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
642 NXP Semiconductors
To Next Page
Loading...
Need help?
General
