Datasheet

Rev.6.00 Oct.28.2004 page 576 of 1016
REJ09B0138-0600H
19.6.3 Flash Memory Operating Modes
Mode Transitions: When the mode pins and the FWE pin are set in the reset state and a reset-start is executed, the MCU
enters one of the operating modes shown in figure 19-8. In user mode, flash memory can be read but not programmed or
erased.
Flash memory can be programmed and erased in boot mode, user program mode, and programmer mode.
Boot mode
On-board programming mode
User
program mode
User mode with
on-chip ROM
enabled
Reset state
Programmer
mode
RES = 0
FWE = 1
FWE = 0
*
2
*
1
Notes: Only make a transition between user mode and user program mode when the CPU is
not accessing the flash memory.
1. MD
2
= MD
1
= MD
0
= 0, P66 = 1, P65 = P64 = 0
2. NMI = 1, FWE = 1, MD
2
= 0, MD
1
= 1
RES = 0
RES = 0
RES = 0
MD
2
= MD
1
= 1
Figure 19-8 Flash Memory Mode Transitions