H8SXSLASH1663M datasheet(1185/1504 Pages) RENESAS

1185 / 1504 page

Section 25 Flash Memory

Rev. 2.00 Sep. 24, 2008 Page 1153 of 1468

REJ09B0412-0200

 Example of FMPDR parameter setting: When the storage destination for the program data

is flash memory, even if the programming 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 the on-chip RAM and then programming must be executed.

12. Programming is executed. The entry point of the programming program is at the address which

is 16 bytes after #DLTOP (start address of the download destination specified by FTDAR).

Call the subroutine to execute programming by using the following steps.

MOV.L

#DLTOP+16,ER2

; Set entry address to ER2

JSR

@ER2

; Call programming routine

NOP

 The general registers other than ER0 and ER1 are held in the programming program.

 R0L is a return value of the FPFR parameter.

 Since the stack area is used in the programming program, a stack area of 128 bytes at the

maximum must be allocated in RAM.

13. The return value in the programming program, the FPFR parameter is determined.

14. Determine whether programming of the necessary data has finished. If more than 128 bytes of

data are to be programmed, update the FMPAR and FMPDR parameters in 128-byte units, and

repeat steps 11 to 14. 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.

15. After programming finishes, clear FKEY and specify software protection. If this LSI is

restarted by a reset immediately after programming has finished, secure the reset input period

(period of

RES = 0) of at least 100 µs.

H8SX/1663M Datasheet(PDF) 1185 Page - Renesas Technology Corp