Renesas H8S/2319 series Hardware Manual page 667

or flash memory except for the above address areas. When the program is located in external
memory, an instruction for programming the flash memory and the following instruction should
be located in on-chip RAM.
Figure 17-44 shows the procedure for executing the program/erase control program when
transferred to on-chip RAM.
Note: The watchdog timer should be activated to prevent overprogramming or overerasing
due to program runaway, etc.
Figure 17-44 User Program Mode Execution Procedure
Write transfer program (and the
program/erase control program if
necessary) beforehand
MD2, MD1, MD0 = 110, 111
Reset-start
Transfer program/erase control
program to RAM
Branch to program/erase control
program in RAM area
Execute program/erase control
program (flash memory rewriting)
Branch to flash memory application
program
Rev. 5.00, 12/03, page 637 of 1088