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6. ROM
3. For further information on FWE application and disconnection, see section 6.9, Flash
Memory Programming and Erasing Precautions.
6.4.2
User Program Mode
When set to user program mode, the chip can program and erase its flash memory by executing a
user programming/erase control program. Therefore, on-board reprogramming of the on-chip flash
memory can be carried out by providing on-board means of FWE control and supply of
programming data, and incorporating a programming/erase control program in part of the program
area as necessary.
To select user program mode, start up in user program mode (TEST2 = 1, TEST = 0), and apply a
high level to the FWE pin. In this mode, on-chip supporting modules other than flash memory
operate as they normally would in user mode.
The flash memory itself cannot be read while the SWE bit is set to 1 to carry out flash memory
programming or erasing, so the control program that performs programming and erasing must be
executed in on-chip RAM.
Rev.3.00 Jul. 19, 2007 page 138 of 532
REJ09B0397-0300
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