Datasheet

Rev. 3.00, 03/04, page 613 of 830
20.1.1 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 20.2.
• 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 setting
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 20.2 Mode Transition of Flash Memory