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Section 25 Flash Memory
25.1.2
Mode Comparison
The comparison table of programming and erasing related items about boot mode, user program
mode, user boot mode, and programmer mode is shown in table 25.1.
Table 25.1 Comparison of Programming Modes
Boot Mode
Programming/
On-board
erasing
environment
Programming/
User MAT
erasing enable
User boot MAT
MAT
All erasure
Block division
erasure
Program data
From host via SCI
transfer
or USB
Reset initiation
Embedded
MAT
program storage
MAT
Transition to user
Changing mode
mode
setting and reset
Notes: 1. All-erasure is performed. After that, the specified block can be erased.
2. Firstly, 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.
•
The user boot MAT can be programmed or erased only in boot mode and programmer mode.
•
The user MAT and user boot MAT are erased in boot mode. Then, the user MAT and user
boot MAT can be programmed by means of the command method. However, the contents of
the MAT cannot be read until this state.
Only user boot MAT is programmed and the user MAT is programmed in user boot mode or
only user MAT is programmed because user boot mode is not used.
•
The boot operation of the optional interface can be performed by the mode pin setting
different from user program mode in user boot mode.
Rev. 1.00 Mar. 12, 2008 Page 920 of 1178
REJ09B0403-0100
User Program
Mode
On-board
User MAT
(Automatic)
1
*
Via optional device Via optional device Via programmer
User MAT
Changing FLSHE
bit and FWE pin
Programmer
User Boot Mode
Mode
On-board
PROM
programmer
User MAT
User MAT
User boot MAT
×
2
User boot MAT*
Changing mode
setting and reset
(Automatic)
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