Datasheet

Table Of Contents
Section 7 ROM
Rev. 2.00 Jul. 04, 2007 Page 137 of 692
REJ09B0309-0200
Table 7.3 System Clock Frequencies for which Automatic Adjustment of LSI Bit Rate is
Possible
Host Bit Rate System Clock Frequency Range of LSI
9,600 bps 8 to 10 MHz
4,800 bps 4 to 10 MHz
2,400 bps 2 to 10 MHz
7.3.2 Programming/Erasing in 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 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 7.2 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 7.5,
Flash Memory Programming/Erasing.
Ye s
No
Program/erase?
Transfer user program/erase control
program to RAM
Reset-start
Branch to user program/erase control
program in RAM
Execute user program/erase control
program (flash memory rewrite)
Branch to flash memory application
program
Branch to flash memory application
program
Figure 7.2 Sample Flowchart of Programming/Erasing in User Program Mode