SH7147 Datasheet, PDF (867/1108 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 20 Flash Memory
be set to H'84000000. Four NOP instructions are executed immediately after the instructions that
set the SCO bit to 1.
1. The user MAT space is switched to the on-chip program storage area.
2. After the selection condition of the download program and the address set in FTDAR are
checked, the transfer processing is executed starting to the on-chip RAM address specified
by FTDAR.
3. The SCO bits in FCCS, FPCS, and FECS are cleared to 0.
4. The return value is set to the DPFR parameter.
5. After the on-chip program storage area is returned to the user MAT space, execution
returns to the user procedure program.
After download is completed and the user procedure program is running, the VBR setting can be
changed.
The notes on download are as follows.
In the download processing, the values of the general registers of the CPU are retained.
During the download processing, interrupts must not be generated. For details on the relationship
between download and interrupts, see section 20.8.2, Interrupts during Programming/Erasing.
Since a stack area of maximum 128 bytes is used, an area of at least 128 bytes must be saved
before setting the SCO bit to 1.
If flash memory is accessed by the DTC during downloading, operation cannot be guaranteed.
Therefore, access by the DTC must not be executed.
(2.4) FKEY is cleared to H'00 for protection.
(2.5) The value of the DPFR parameter must be checked to confirm the download result.
A recommended procedure for confirming the download result is shown below.
1. Check the value of the DPFR parameter (one byte of start address of the download
destination specified by FTDAR). If the value is H'00, download has been performed
normally. If the value is not H'00, the source that caused download to fail can be
investigated by the description below.
2. If the value of the DPFR parameter is the same as before downloading (e.g. H'FF), the
address setting of the download destination in FTDAR may be abnormal. In this case,
confirm the setting of the TDER bit (bit 7) in FTDAR.
3. If the value of the DPFR parameter is different from before downloading, check the SS bit
(bit 2) and the FK bit (bit 1) in the DPFR parameter to ensure that the download program
selection and FKEY register setting were normal, respectively.
Rev. 3.00 Oct. 06, 2008 Page 843 of 1080
REJ09B0230-0300