Datasheet

Section 17 ROM
Rev.7.00 Feb. 14, 2007 page 731 of 1108
REJ09B0089-0700
[15] After programming finishes, clear FKEY and specify software protection.
If this LSI is restarted by a power-on reset immediately after user MAT programming has
finished, secure a reset period (period of RES = 0) that is at least as long as normal 100 μs.
Erasing Procedure in User Program Mode: The procedures for download, initialization, and
erasing are shown in figure 17.71.
Start erasing procedure
program
Select on-chip program
to be downloaded and set
download destination
by FTDAR
Set FKEY to H'A5
Set SCO to 1 and
execute download
DPFR = 0?
Yes
No
Download error processing
Set the FPEFEQ and
FUBRA parameters
Initialization
JSR FTDAR setting +32
Yes
End erasing
procedure program
FPFR=0 ?
No
Initialization error processing
Disable interrupts and
bus master operation
other than CPU
Clear FKEY to 0
Set FEBS parameter
Erasing
JSR FTDAR setting +16
Yes
FPFR=0 ?
No
Clear FKEY and erasing
error processing
Yes
Required block
erasing is
completed?
No
Set FKEY to H'5A
Clear FKEY to 0
(a)
(b)
(c)
(d)
(e)
(f)
1
1
Download
Initialization
Erasing
Figure 17.71 Erasing Procedure
The procedure program must be executed in an area other than the user MAT to be erased.
Especially the part where the SCO bit in FCCS is set to 1 for downloading must be executed in on-
chip RAM.
The area that can be executed in the steps of the user procedure program (on-chip RAM, user
MAT, and external space) is shown in section 17.29.3, Procedure Program and Storable Area for
Programming Data.
For the downloaded on-chip program area, refer to the RAM map for programming/erasing in
figure 17.69.