mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 581

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

1. Address must be 32-bit aligned (two LSBs must be zero).
2. One byte of dummy data must be shifted in before valid data is shifted out.
3. Address must be 32-bit aligned (two LSBs must be zero).
4. A section is defined as the smaller of either half the size of FlexRAM or the flash sector size. Total number of data bytes
5. Bulk Erase is accepted when security is set only if the BEDIS status bit is not set.
6. Note that the Flash will be in NVM Special mode, restricting which types of commands can be executed through
25.3.1 Command Descriptions
This section describes the module commands.
25.3.1.1 Write Enable
The Write Enable command (WREN) sets the write enable register bit in the EzPort
status register. The write enable bit must be set for a write command (SP, SE, BE,
WRFCCOB or WRFLEXRAM) to be accepted. The write enable register bit clears on
reset, on a Write Disable command, and at the completion of write command. This
command should not be used if a write is already in progress.
25.3.1.2 Write Disable
The Write Disable command (WRDI) clears the write enable register bit in the status
register. This command should not be used if a write is already in progress.
25.3.1.3 Read Status Register
The Read Status Register command (RDSR) returns the contents of the EzPort status
register.
Freescale Semiconductor, Inc.
FAST_RDFLEXRAM
FAST_RDFCCOB
programmed must be a multiple of 4.
WRITE_FCCOB when security is enabled.
WRFLEXRAM
RDFLEXRAM
WRFCCOB
Command
RESET
Read FCCOB registers at high
Read FlexRAM at high speed
Write FCCOB Registers
Table 25-2. EzPort Commands (continued)
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Write FlexRAM
Read FlexRAM
Description
Reset Chip
speed
Preliminary
0xBC
0xBD
Code
0xB9
0xBA
0xBB
0xBE
Address
Bytes
3
3
3
0
0
0
1
1
1
Data Bytes
1 - 12
1+
12
1+
0
4
2
2
Chapter 25 EzPort
Accepted when
secure?
Yes
Yes
No
No
No
No
6
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