R8C/20 Group, R8C/21 Group 19. Flash Memory
Rev.2.00 Aug 27, 2008 Page 377 of 458
REJ09B0250-0200
19.2 Memory Map
The flash memory contains a user ROM area and a boot ROM area (reserved area).
Figure 19.1 shows the Flash Memory Block Diagram for R8C/20 Group. Figure 19.2 shows the Flash Memory
Block Diagram for R8C/21 Group.
The user ROM area of R8C/21 Group contains an area which stores a MCU operating program (program ROM)
and the 1-Kbyte block A and B (data flash).
The user ROM area is divided into several blocks. The user ROM area can be rewritten in CPU rewrite and
standard serial I/O and parallel I/O modes.
When rewriting the block 0 and block 1 in CPU rewrite mode, set the FMR02 bit in the FMR0 register to 1 (rewrite
enables), and when setting the FMR15 bit in the FMR1 register to 0 (rewrite enables), block 0 is rewritable. When
setting the FMR16 bit to 0 (rewrite enables), block 1 is rewritable.
When rewriting the block 2 and block 3 in CPU rewrite mode, set the FMR02 bit in the FMR0 register to 1 (rewrite
enables).
The rewrite control program for standard serial I/O mode is stored in boot ROM area before shipment. The boot
ROM area and the user ROM area share the same address, but have an another memory.
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