hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 209

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

6.7.2
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.
Figure 6.9 Programming/Erasing Flowchart Example in User Program Mode
Programming/Erasing in User Program Mode
Branch to user program/erase control
Transfer user program/erase control
Execute user program/erase control
Branch to flash memory application
program (flash memory rewrite)
program to RAM
program in RAM
Program/erase?
Reset-start
program
Yes
No
Branch to flash memory application
Rev. 7.00 Mar 10, 2005 page 167 of 652
program
REJ09B0042-0700
Section 6 ROM