Datasheet

Section 19 Flash Memory
Rev. 3.00 Sep. 28, 2009 Page 557 of 710
REJ09B0384-0300
(3) User MAT Erasing in User Boot Mode
For erasing the user MAT in user boot mode, additional processing made by setting FMATS are
required: switching from user-boot-MAT selection state to user-MAT selection state, and
switching back to user-boot-MAT selection state after erasing completes.
Figure 19.15 shows the procedure for erasing the user MAT in user boot mode.
Yes
No
Start erasing
procedure program
Set FKEY to H'A5
Yes
No
Download error processing
Set the FPEFEQ
parameters
End erasing
procedure program
FPFR = 0 ?
Initialization error processing
Disable interrupts
and bus master operation
other than CPU
Clear FKEY to 0
Set FEBS parameter
Yes
No
Clear FKEY and erasing
error processing
Yes
Required
block erasing is
completed?
No
Set FKEY to H'A5
Clear FKEY to 0
1
1
Download
Initialization
Erasing
Set FMATS to value other
than H'AA to select user MAT
Set SCO to 1 and
execute download
Set FMATS to H'AA to
select user boot MAT
User-boot-MAT selection state
User-MAT selection state
User-boot-MAT
selection state
Note: The MAT must be switched by FMATS to perform
the erasing error processing in the user boot MAT.
MAT
switchover
MAT
switchover
DPFR = 0 ?
Initialization
JSR FTDAR setting + 32
Programming
JSR FTDAR setting + 16
FPFR = 0 ?
Select on-chip program
to be downloaded and
specify download
destination by FTDAR
Figure 19.15 Procedure for Erasing User MAT in User Boot Mode
The difference between the erasing procedures in user program mode and user boot mode depends
on whether the MAT is switched or not as shown in figure 19.15.