R5F72115D160FPV datasheet(952/1228 Pages) RENESAS

952 / 1228 page

Section 21 Flash Memory

Rev. 2.00 May. 08, 2008 Page 928 of 1200

REJ09B0344-0200

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 21.7.2, Interrupts during

Programming/Erasing.

Since a stack area of maximum 256 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 DMAC during downloading, operation cannot be

guaranteed. Therefore, access by the DMAC 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.

R5F72115D160FPV Datasheet(PDF) 952 Page - Renesas Technology Corp