Datasheet

Section 21 Flash Memory
Rev. 2.00 Sep. 28, 2009 Page 645 of 870
REJ09B0429-0200
21.1.1 Operating Mode
When each mode pin and the FWE pin are set in the reset state and reset start is performed, this
LSI enters each operating mode as shown in figure 21.2.
• 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 boot mode, user
program mode, and user boot mode.
• Flash memory can be read, programmed, or erased by means of the PROM programmer in
programmer mode.
Reset state
Programmer
mode
User mode
User program
mode
User boot
mode
Boot mode
On-board programming mode
RES
=
0
RES
=
0
User mode settin
g
User boot
mode setting
RES
=
0
Boot mode setting
RES
=
0
RES = 0
Programmer mode setting
FLSHE = 0
→ FWE = 0
FWE = 1 →
FLSHE = 1
Figure 21.2 Mode Transition of Flash Memory