Table 30-2. EzPort Commands (continued)
Command
Description
Code
Address
Bytes
Data Bytes
Accepted when
secure?
RESET
Reset Chip
0xB9
0
0
Yes
WRFCCOB
Write FCCOB Registers
0xBA
0
12
FAST_RDFCCOB
Read FCCOB registers at high
speed
0xBB
0
No
WRFLEXRAM
Write FlexRAM
0xBC
4
No
RDFLEXRAM
Read FlexRAM
0xBD
1+
No
FAST_RDFLEXRAM
Read FlexRAM at high speed
0xBE
1+
No
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 64-bit aligned (three 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
programmed must be a multiple of 8.
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
WRITE_FCCOB when security is enabled.
30.3.1 Command Descriptions
This section describes the module commands.
30.3.1.1 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.
30.3.1.2 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.
30.3.1.3 Read Status Register
The Read Status Register command (RDSR) returns the contents of the EzPort status
register.
Chapter 30 EzPort
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
755
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