SH7080_09 Datasheet, PDF (1324/1622 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family

Section 23 Flash Memory
After the programming/erasing program has been downloaded and the SCO bit is cleared to 0,
the setting of the frequency control register (FRQCR) can be changed to the desired value.
For the downloaded on-chip program area, see the RAM map for programming/erasing in
figure 23.10.
A single divided block is erased by one erasing processing. For block divisions, see figure
23.4. To erase two or more blocks, update the erase block number and perform the erasing
processing for each block.
(3.1) Select the on-chip program to be downloaded
Set the EPVB bit in FECS to 1.
Several programming/erasing programs cannot be selected at one time. If several programs are
set, download is not performed and a download error is returned to the source select error
detect (SS) bit in the DPFR parameter.
Specify the start address of the download destination by FTDAR.
The procedures to be carried out after setting FKEY, e.g. download and initialization, are the
same as those in the programming procedure. For details, see the description in section 23.5.2
(2), Programming Procedure in User Program Mode.
(3.2) Set the FEBS parameter necessary for erasure
Set the erase block number of the user MAT in the flash erase block select parameter (FEBS:
general register R4). If a value other than an erase block number of the user MAT is set, no
block is erased even though the erasing program is executed, and an error is returned to the
return value parameter FPFR.
(3.3) Erasure
Similar to as in programming, there is an entry point of the erasing program in the area from
(download start address set by FTDAR) + 16 bytes of on-chip RAM. The subroutine is called
and erasing is executed by using the following steps.
MOV.L #DLTOP+16,R1
JSR @R1
NOP
; Set entry address to R1
; Call erasing routine
⎯ The general registers other than R0 are saved in the erasing program.
⎯ R0 is a return value of the FPFR parameter.
⎯ Since the stack area is used in the erasing program, a stack area of maximum 128 bytes
must be reserved in RAM.
Rev. 4.00 Dec. 15, 2009 Page 1264 of 1558
REJ09B0181-0400