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24.8
On-Board Programming Mode
When the mode pins (MD1, and MD2) are set to on-board programming mode and the reset start
is executed, a transition is made to on-board programming mode in which the on-chip flash
memory can be programmed/erased. On-board programming mode has three operating modes:
boot mode, user boot mode, and user program mode.
Table 24.7 shows the pin setting for each operating mode. For details on the state transition of
each operating mode for flash memory, see figure 24.2.
Table 24.7 On-Board Programming Mode Setting
Mode Setting
Boot mode
User program mode
User boot mode
24.8.1
Boot Mode
Boot mode executes programming/erasing of the user MAT and the user boot MAT by means of
the control command and program data transmitted from the externally connected host via the on-
chip SCI_1.
In boot mode, the tool for transmitting the control command and program data, and the program
data must be prepared in the host. The serial communication mode is set to asynchronous mode.
The system configuration in boot mode is shown in figure 24.6. Interrupts are ignored in boot
mode. Configure the user system so that interrupts do not occur.
Host
Programming
tool and program
data
MD2
1
0
1
Control command,
program data
Response
Figure 24.6 System Configuration in Boot Mode
Section 24 Flash Memory
MD1
0
1
0
This LSI
Software for
analyzing
control
commands
(on-chip)
RxD1
On-chip
SCI_1
TxD1
Rev. 1.00 May 09, 2008 Page 743 of 954
NMI
1
0/1
0
Flash
memory
RAM
REJ09B0462-0100
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