mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 534

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

Flash Operation in Low-Power Modes
23.4.11.10 Read Once Command
The Read Once command provides read access to a reserved 64-byte field located in the
program flash IFR (see
field is via 16 records, each 4 bytes long. The Read Once field is programmed using the
Program Once command described in
After clearing CCIF to launch the Read Once command, a 4-byte Read Once record is
read from the program flash IFR and stored in the FCCOB register. The CCIF flag is set
after the Read Once operation completes. Valid record index values for the Read Once
command range from 0x00 to 0x0F. During execution of the Read Once command, any
attempt to read addresses within the program flash block containing this 64-byte field
returns invalid data. The Read Once command can be executed any number of times.
23.4.11.11 Program Once Command
The Program Once command enables programming to a reserved 64-byte field in the
program flash IFR (see
Program Once field is via 16 records, each 4 bytes long. The Program Once field can be
read using the Read Once command (see
Resource command (see
programmed only once since the program flash IFR cannot be erased.
534
Command not available in current mode/security
An invalid record index is supplied
Error Condition
FCCOB Number
0
1
2
3
4
5
6
7
Table 23-56. Read Once Command FCCOB Requirements
Table 23-57. Read Once Command Error Handling
Program Flash IFR Map
Program Flash IFR Map
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Read Resource
Program Once
Returned Values
Preliminary
Read Once record index (0x00 - 0x0F)
Command). Each Program Once record can be
Read Once
Read Once byte 0 value
Read Once byte 1 value
Read Once byte 2 value
Read Once byte 3 value
FCCOB Contents [7:0]
0x41 (RDONCE)
and
and
Not used
Not used
Program Once
Program Once
Command) or using the Read
Command.
Field). Access to this
Field). Access to the
Freescale Semiconductor, Inc.
FSTAT[ACCERR]
FSTAT[ACCERR]
Error Bit