SH7059 Datasheet, PDF (847/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

25. ROM (SH7059)
The start address of the programming destination of the user MAT (FMPAR) is set to general register R5. The start
address of the program data storage area (FMPDR) is set to general register R4.
• FMPAR setting
FMPAR specifies the programming destination start address. When an address other than one in the user MAT
area is specified, even if the programming program is executed, programming is not executed and an error is
returned to the return value parameter FPFR. Since the unit is 128 bytes, the lower eight bits (MOA7 to MOA0)
must be in the 128-byte boundary of H'00 or H'80.
• FMPDR setting
If the storage destination of the program data is flash memory, even when the program execution routine is
executed, programming is not executed and an error is returned to the FPFR parameter. In this case, the
program data must be transferred to on-chip RAM and then programming must be executed.
(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
; Set entry address to R1
JSR @R1
; Call programming routine
NOP
⎯ The general registers other than R0 are saved in the programming program.
⎯ R0 is a return value of the FPFR parameter.
⎯ 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 judged.
(2.13) Determine whether programming of the necessary data has finished.
If more than 128 bytes of data are to be programmed, specify FMPAR and FMPDR in 128-byte units, and repeat steps
(2.10) to (2.13). Increment the programming destination address by 128 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.3.00 Mar. 12, 2008 Page 757 of 948
REJ09B0177-0300