mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 490

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Memory Map and Registers
23.3.2.1 Program Once Field
The Program Once Field in the program flash IFR provides 64 bytes of user data storage
separate from the program flash main array. The user can program the Program Once
Field one time only as there is no program flash IFR erase mechanism available to the
user. The Program Once Field can be read any number of times. This section of the
program flash IFR is accessed in 4-Byte records using the Read Once and Program Once
commands (see
23.3.3 Data Flash IFR Map
The data flash IFR is a 256 byte nonvolatile information memory that can be read and
erased, but the user has limited program capabilities in the data flash IFR (see the
Program Partition command in
command in
Resource
table and further described in the subsequent paragraphs.
23.3.3.1 EEPROM Data Set Size
The EEPROM data set size byte in the data flash IFR supplies information which
determines the amount of FlexRAM used in each of the available EEPROM subsystems.
To program the EEESIZE value, see the Program Partition command described in
Program Partition
490
0x00 – 0xFD
0xFE
0xFF
Address Range
7
1
Command). The contents of the data flash IFR are summarized in the following
Erase All Blocks
Read Once Command
6
1
Command.
Data flash IFR: 0x00FE
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Table 23-1. EEPROM Data Set Size
5
1
Command, and the Read Resource command in
254
1
1
Size (Bytes)
Program Partition
and
4
1
= Unimplemented or Reserved
Preliminary
Program Once
Command, the Erase All Blocks
3
Command).
Reserved
EEPROM data set size
FlexNVM partition code
Field Description
2
EEESIZE
Freescale Semiconductor, Inc.
1
Read
0