Renesas H8S/2100 Series, Hardware Manual

Page: 792 / 1024

Section 24 Flash Memory
Rev. 1.00 Apr. 28, 2008 Page 766 of 994
REJ09B0452-0100
(b) Initialization before Programming/Erasing
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
register ER1. This parameter is called the flash multipurpose address area parameter (FMPAR).
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 24.8.2, 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 10 as the erase block number.
For details on the erasing procedure, see section 24.8.2, User Program Mode.