H8SXSLASH1663M datasheet(1158/1504 Pages) RENESAS

1158 / 1504 page

Section 25 Flash Memory

Rev. 2.00 Sep. 24, 2008 Page 1126 of 1468

REJ09B0412-0200

(b)

Initialization before Programming/Erasure

The on-chip program includes the initialization program. A pulse with the specified period must

be applied when programming or erasing. The specified pulse width is made by the method in

which wait loop is configured by the CPU instruction. Accordingly, the operating frequency of the

CPU must be set. The initial program is set as a parameter of the programming/erasing program

which has been downloaded to perform these settings.

(c)

Programming

When the flash memory is programmed, the start address of the programming destination on the

user MAT and the program data must be passed to the programming program.

The start address of the programming destination on the user MAT must be stored in general

The program data is always in 128-byte units. When the program data does not satisfy 128 bytes,

128-byte program data is prepared by filling the dummy code (H'FF). The boundary of the start

address of the programming destination on the user MAT is aligned at an address where the lower

eight bits (A7 to A0) are H'00 or H'80.

The program data for the user MAT must be prepared in consecutive areas. The program data

must be in a consecutive space which can be accessed using the MOV.B instruction of the CPU

and is not in the flash memory space.

The start address of the area that stores the data to be written in the user MAT must be set in

general register ER0. This parameter is called the flash multipurpose data destination area

parameter (FMPDR).

For details on the programming procedure, see section 25.8.3, User Program Mode.

(d)

Erasure

When the flash memory is erased, the erase block number on the user MAT must be passed to the

erasing program which is downloaded.

The erase block number on the user MAT must be set in general register ER0. This parameter is

called the flash erase block select parameter (FEBS).

One block is selected from the block numbers of 0 to 19 as the erase block number.

For details on the erasing procedure, see section 25.8.3, User Program Mode.

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