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M16C/29 Group
The M16C/29 (flash memory version) contains the flash memory that can be rewritten with a single voltage.
For this flash memory, four flash memory modes area available in which to read, program, and erase:
parallel I/O, standard serial I/O and CAN I/O modes in which the flash memory can be manipulated using a
programmer and a CPU rewrite mode in which the flash memory can be manipulated by the Central Pro-
cessing Unit (CPU). Each mode is detailed in the following sections.
The flash memory is divided into several blocks as shown in Figures 21.2.1 to 21.2.3, so that memory can
be erased one block at time.
In addition to the user ROM area to store a microcomputer operation control program, the flash memory
has a boot ROM area that is used to store a program to control rewriting in CPU rewrite and standard serial
I/O mode. This boot ROM area has a standard serial I/O mode control program stored in it when shipped
from the factory, which can be rewritten with a rewrite control program, to suit the user's application system.
When the CPU is shifted to the stop or wait modes, power to the internal flash memory is automatically shut
off. It is reconnected automatically when CPU operation is restored.
00F000
16
00F7FF
16
00F800
16
00FFFF
16
0E8000
16
0EFFFF
16
0F0000
16
0F7FFF
16
0F8000
16
0FBFFF
16
0FC000
16
0FDFFF
16
0FE000
16
0FFFFF
16
Figure 21.2.2. Flash Memory Block Diagram (ROM capacity 96K byte)
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
Block B :2K bytes (Note 2)
Block A :2K bytes (Note 2)
Block 4 : 32K bytes (Note 5)
Block 3 : 32K bytes (Note 5)
Block 2 : 16K bytes
Block 2 : 16K bytes (Note 5)
Block 1 : 8K bytes (Note 3)
Block 0 : 8K bytes (Note 3)
User ROM area
page 368 of 402
Note 1: To specify a block, use the maximum even address in the block.
Note 2: Blocks A and B are enabled to use when the PM10 bit in the PM1
register is set to "1".
Note 3: Blocks 0 and 1 are enabled for programs and erases when the
FMR02 bit in the FMR0 register is set to "1" and the FMR16 bit in
the FMR1 register is set to "1". (CPU rewrite mode only)
Note 4: The boot ROM area is reserved. Do not access.
Note 5: Blocks 2 to 4 are enabled for programs and erases when the
FMR16 bit in the FMR1 register is set to "1". (CPU rewrite mode
only)
0FF000
16
4K bytes (Note 4)
0FFFFF
16
Boot ROM area
21. Flash Memory Version
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