HD64F38024HV Datasheet, PDF (191/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

Section 6 ROM
6.7.2 Programming/Erasing in User Program Mode
The term user mode refers to the status when a user program is being executed. On-board
programming/erasing of an individual flash memory block can also be performed in user program
mode by branching to a user program/erase control program. The user must set branching
conditions and provide on-board means of supplying programming data. The flash memory must
contain the user program/erase control program or a program that provides the user program/erase
control program from external memory. As the flash memory itself cannot be read during
programming/erasing, transfer the user program/erase control program to on-chip RAM, as in boot
mode. Figure 6.9 shows a sample procedure for programming/erasing in user program mode.
Prepare a user program/erase control program in accordance with the description in section 6.8,
Flash Memory Programming/Erasing.
Reset-start
No
Program/erase?
Yes
Transfer user program/erase control
program to RAM
Branch to user program/erase control
program in RAM
Branch to flash memory application
program
Execute user program/erase control
program (flash memory rewrite)
Branch to flash memory application
program
Figure 6.9 Programming/Erasing Flowchart Example in User Program Mode
Rev. 8.00 Mar. 09, 2010 Page 169 of 658
REJ09B0042-0800