D12320VF25V Datasheet, PDF (769/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
Start programming
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
Clear FKEY to 0
DPFR=0 ?
No
Yes _{Download error processing}
Set the FPEFEQ
and parameter
Initialization
JSR FTDAR setting+32
FPFR=0 ?
No
Yes _{Initialization error processing}
Disable interrupts
and bus master operation
other than CPU
1
User-boot-MAT
selection state
1
Set FMATS to value other than
MAT
H'AA to select user MAT _switchover
Set FKEY to H'5A
Set parameter to ER0 and
ER1 (FMPAR and FMPDR)
Programming
JSR FTDAR setting+16
FPFR=0 ?
No
Yes ^{Clear FKEY and programming}
error processing*
No
Required data
programming is
completed?
Yes
Clear FKEY to 0
Set FMATS to H'AA to
MAT
select user boot MAT _switchover
End programming
procedure program
Note: * The MAT must be switched by FMATS
to perform the programming error
processing in the user boot MAT.
Figure 17.73 Procedure for Programming User MAT in User Boot Mode
The difference between the programming procedures in user program mode and user boot mode is
whether the MAT is switched or not as shown in figure 17.73.
In user boot mode, the user boot MAT can be seen in the flash memory space with the user MAT
hidden in the background. The user MAT and user boot MAT are switched only while the user
MAT is being programmed. Because the user boot MAT is hidden while the user MAT is being
programmed, the procedure program must be located in an area other than flash memory. After
programming finishes, switch the MATs again to return to the first state.
MAT switchover is enabled by writing a specific value to FMATS. However note that while the
MATs are being switched, the LSI is in an unstable state, e.g. access to a MAT is not allowed until
MAT switching is completely finished, and if an interrupt occurs, from which MAT the interrupt
Rev.7.00 Feb. 14, 2007 page 735 of 1108
REJ09B0089-0700