H8S2378 Datasheet, PDF (913/1203 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series

Section 20 Flash Memory (0.35-µm F-ZTAT Version)
Table 20.6 System Clock Frequencies for which Automatic Adjustment of LSI Bit Rate Is
Possible
Host Bit Rate
19,200 bps
9,600 bps
System Clock Frequency Range of LSI
8 to 25 MHz
8 to 25 MHz
20.6.2 User Program Mode
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 program. The user must set branching
conditions and provide on-board means of supplying programming data. The flash memory must
contain the program/erase program or a program which provides the program/erase program from
external memory. Because the flash memory itself cannot be read during programming/erasing,
transfer the program/erase program to on-chip RAM, as like in boot mode. Figure 20.6 shows a
sample procedure for programming/erasing in user program mode. Prepare a program/erase
program in accordance with the description in section 20.7, Flash Memory Programming/Erasing.
Reset-start
No
Program/erase?
Yes
Transfer user program/erase control
program to RAM
Branch to flash memory application
program
Branch to user program/erase control
program in RAM
Execute user program/erase control
program (flash memory programming)
Branch to flash memory application
program
Figure 20.6 Programming/Erasing Flowchart Example in User Program Mode
Rev. 6.00 Jul 19, 2006 page 849 of 1136
REJ09B0109-0600