H8SX1520 Datasheet, PDF (637/846 Pages) Renesas Technology Corp – 32-Bit CISC Microcomputer H8SX Family H8SX/1500 Series

Section 17 Flash Memory (0.18-(m F-ZTAT Version)
17.8 On-Board Programming Mode
When the mode pins (MD0, 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 17.5 shows the pin setting for each operating mode. For details on the state transition of
each operating mode for flash memory, see figure 17.2.
Table 17.5 On-Board Programming Mode Setting
Mode Setting
User boot mode
Boot mode
User program mode
MD1
0
1
1
MD0
1
0
1
17.8.1 Boot Mode
Boot mode executes programming/erasing of the user MAT or user boot MAT by means of the
control command and program data transmitted from the externally connected host via the on-chip
SCI_4.
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 17.6. Interrupts are ignored in boot
mode. Configure the user system so that interrupts do not occur.
Host
Programming
tool and program
data
Control command,
program data
Response
This LSI
Software for
analyzing
control
commands
(on-chip)
Flash
memory
RxD4
SCI_4
TxD4
On-chip
RAM
Figure 17.6 System Configuration in Boot Mode
Rev. 3.00 Mar. 14, 2006 Page 599 of 804
REJ09B0104-0300