SH7280 Datasheet, PDF (1461/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 26 Flash Memory
(2.11) Programming
There is an entry point of the programming program in the area from (download start address
set by FTDAR) + 16 bytes of on-chip RAM. The subroutine is called and programming is
executed by using the following steps.
MOV.L #DLTOP+16,R1
JSR @R1
NOP
; Set entry address to R1
; Call programming routine
1. The general registers other than R0 are saved in the programming program.
2. R0 is a return value of the FPFR parameter.
3. Since the stack area is used in the programming program, a stack area of maximum 128
bytes must be reserved in RAM.
(2.12) The return value in the programming program, FPFR (general register R0) is checked.
(2.13) Determine whether programming of the necessary data has finished.
If more than 256 bytes of data are to be programmed, specify FMPAR and FMPDR in 256-
byte units, and repeat steps (2.10) to (2.13). Increment the programming destination address by
256 bytes and update the programming data pointer correctly. If an address which has already
been programmed is written to again, not only will a programming error occur, but also flash
memory will be damaged.
(2.14) After programming finishes, clear FKEY and specify software protection.
If this LSI is restarted by a power-on reset immediately after user MAT programming has
finished, secure a reset period (period of RES = 0) that is at least as long as the normal 100 µs.
Rev. 1.00 Jun. 26, 2008 Page 1431 of 1692
REJ09B0393-0100