Datasheet

Section 21 Flash Memory (0.18-μm F-ZTAT Version)
Rev.7.00 Mar. 18, 2009 page 864 of 1136
REJ09B0109-0700
21.1.1 Operating Mode
When the mode pins are set in the reset state and a reset start is performed, the MCU transitions to
an operating mode as shown in figure 21.2.
• 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
RES = 0
ROM invalid
mode setting
RES
=
0
User mode setting
User boot
mode setting
RES
=
0
Boot mode setting
RES
=
0
RES = 0
PROM mode setting
FLSHE = 0
FLSHE = 1
Figure 21.2 Mode Transition of Flash Memory