Datasheet

Section 20 Flash Memory (0.18-μm F-ZTAT Version)
Rev.6.00 Mar. 18, 2009 Page 762 of 980
REJ09B0050-0600
(3) Erasing Procedure in User Program Mode
The procedures for download, initialization, and erasing are shown in figure 20.12.
Set FKEY to H'A5
Set SCO to 1 and
execute download
DPFR = 0?
Yes
No
Download error processing
Set the FPEFEQ, FUBRA
parameters
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
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
1.
2.
3.
4.
5.
6.
a
a
Download
Initialization
Erasing
Initialization
JSR FTDAR setting + 32
Erasing
JSR FTDAR setting + 16
Select on-chip program
to be downloaded and
specify download
destination by FTDAR
Start erasing procedure
program
Figure 20.12 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 the
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 20.4.4, Procedure Program and Storable Area for
Programming Data.
For the downloaded on-chip program area, refer to figure 20.10.