After receiving 12 bytes of data, EzPort writes the data to the FCCOB 0-B registers in the
flash and then automatically launches the command within the flash. If greater or less
than 12 bytes of data is received, this command has unexpected results and may result in
the WEF flag being set.
This command is not accepted if the WEF or WIP field is set or if the WEN field is not
set in the EzPort status register.
30.3.1.11 Read FCCOB Registers at High Speed
CMD[7:0]=0xBB
FCCOB_0[7:0]
FCCOB_B[7:0]
Dummy Byte
EZP_CK
EZP_CS
EZP_D
EZP_Q
Figure 30-12. Read FCCOB Registers at High Speed command sequence
The Read FCCOB Registers at High Speed (FAST_RDFCCOB) command allows the
user to read the contents of the flash common command object registers. After receiving
the command, EzPort waits for one dummy byte of data before returning FCCOB register
data starting at FCCOB 0 and ending with FCCOB B.
This command can be run with an EzPort clock (EZP_CK) frequency half the internal
system clock frequency of the microcontroller or slower. Attempts to read greater than 12
bytes of data returns unknown data. This command is not accepted if the WEF, WIP, or
FS fields in the EzPort status register are 1.
30.4 Flash memory map for EzPort access
The following table shows the flash memory map for access through EzPort.
NOTE
The flash block address map for access through EzPort may not
conform to the system memory map. Changes are made to
allow the EzPort address width to remain 24 bits.
Flash memory map for EzPort access
K22F Sub-Family Reference Manual , Rev. 3, 7/2014
668
Freescale Semiconductor, Inc.
