Datasheet

Section 22 Flash Memory
Rev. 3.00 Sep. 28, 2009 Page 677 of 910
REJ09B0350-0300
Reset state
Programmer
mode
User mode
User
program
mode
Boot mode
On-board programming mode
End of
programming/
erasure
Start of
programming/
erasure
RES = 0
User m
od
e setting
RES
= 0
Boot mode setting
Use
r boot mode
setting
R
E
S
= 0
RES = 0
RES = 0
Programmer mode setting
User
boot mode
Figure 22.2 Mode Transition of Flash Memory
Table 22.1 Differences between Boot Mode, User Program Mode, and Programmer Mode
Item Boot Mode User Program Mode User Boot Mode
Programmer
Mode
Programming/
erasing environment
On-board
programming
On-board
programming
On-board
programming
PROM
programmer
Programming/
erasing enable MAT
• User MAT
• User boot
MAT
• User MAT • User MAT • User MAT
• User boot
MAT
All erasure O (Automatic) O O O (Automatic)
Block division
erasure
O*
1
O O ×
Program data
transfer
From host via
SCI
Via any device Via any device Via
programmer
Reset initiation MAT Embedded
program
storage area
User MAT User boot MAT*
2
⎯
Transition to user
mode
Changing mode
and reset
Changing FLSHE bit
setting
Changing mode
and reset
⎯
Notes: 1. All-erasure is performed. After that, the specified block can be erased.
2. First, the reset vector is fetched from the embedded program storage MAT. After the
flash memory related registers are checked, the reset vector is fetched from the user
boot MAT.