Renesas R8C/20

R8C/20 Group, R8C/21 Group 19. Flash Memory
Rev.2.00 Aug 27, 2008 Page 376 of 458
REJ09B0250-0200
Table 19.2 Flash Memory Rewrite Modes
Flash Memory
Rewrite Mode
CPU Rewrite Mode Standard Serial I/O Mode Parallel I/O Mode
Function User ROM area is rewritten by
executing software commands
from the CPU.
EW0 mode: Rewritable in the
RAM
EW1 mode: Rewritable in flash
memory
User ROM area is rewritten
by using a dedicated serial
programmer.
User ROM area is
rewritten by using a
dedicated parallel
programmer.
Areas which can
be rewritten
User ROM area User ROM area User ROM area
Operating mode Single chip mode Boot mode Parallel I/O mode
ROM
programmer
None Serial programmer Parallel programmer