Datasheet

Section 17 ROM
Rev.7.00 Feb. 14, 2007 page 689 of 1108
REJ09B0089-0700
17.22.3 Operating Mode of Flash Memory
When each mode pin is set in the reset state and reset start is performed, the microcomputer enters
each operating mode as shown in figure 17.61. For the setting of each mode pin, see table 17.52.
• Flash memory cannot be read, programmed, or erased in ROM invalid mode.
• Flash memory can be read in user mode, but cannot be programmed or erased.
• Flash memory can be read, programmed, or erased on the board only in user program mode,
user boot mode, and boot mode.
• Flash memory can be read, programmed, or erased by means of the PROM programmer in
PROM mode.
Reset state
ROM invalid
mode
PROM mode
User mode
User program
mode
User boot
mode
Boot mode
On-board programming mode
FLSHE=0
RAM emulation is enabled
FLSHE=1
RES=0
ROM invalid
mode setting
RES=0
User mode
setti
ng
RES=0
User boot
mode setti
ng
RES=0
Boot
mode setting
RES=0
RES=0
PROM mode setting
Figure 17.61 Mode Transition of Flash Memory