HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 575

• Manufacturer Part Number: HD64F7050
• Description: 32-Bit RISC Microcomputer SuperH RISC engine Family/
• Manufacturer: RENESAS [Renesas Technology Corp]

18.6.2
After setting FWE, the user should branch to, and execute, the previously prepared
programming/erase control program.
As the flash memory itself cannot be read while flash memory programming/erasing is being
executed, the control program that performs programming and erasing should be run in on-chip
RAM or external memory.
Use the following procedure (figure 18.6) to execute the programming control program that writes
to flash memory (when transferred to RAM).
Note: When programming and erasing, start the watchdog timer so that measures can be taken to
prevent program runaway, etc. Memory cells may not operate normally if
overprogrammed or overerased due to program runaway.
User Program Mode
Figure 18.6 User Program Mode Execution Procedure
1
2
3
4
5
Write FWE assessment program
erase control program in RAM
Transfer programming/erase
Execute user application
control program to RAM
(flash memory rewriting)
Execute programming/
and transfer program
(user program mode)
FWE = 1
program
Rev. 5.00 Jan 06, 2006 page 555 of 818
Section 18 ROM (128 kB Version)
REJ09B0273-0500