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22.3 Flash Memory Programming
On-board writing of flash memory (with the device mounted on the target system) is supported.
On-board writing is done after connecting a dedicated flash writer (Flashpro III (part number: FL-PR3, PG-FP3)
to the host machine and target system.
Moreover, writing to flash memory can also be performed using a flash memory writing adapter connected to
Flashpro III.
Remark Flashpro III is a product of Naito Densei Machida Mfg. Co., Ltd.
22.3.1 Selection of transmission method
Writing to flash memory is performed using Flashpro III and serial communication. Select the transmission method
for writing from Table 22-3. For the selection of the transmission method, a format like the one shown in Figure
22-3 is used. The transmission methods are selected with the V
Transmission Method
3-wire serial I/O
UART
Note When the device enters the flash memory programming mode, the pins not used for flash memory
programming are in the same status as immediately after reset. If the external device connected to each
port does not recognize the port status immediately after reset, therefore, the pin must be connected to V
or V
via a resistor.
SS
Cautions 1. Be sure to select the number of V
2. If performing write operations to flash memory with the UART transmission method, set the
main system clock oscillation frequency to 4.19 MHz or higher.
V
PP
RESET
278
CHAPTER 22 µ PD78F0852
Table 22-3. Transmission Method List
Number of Channels
2
1
pulses shown in Table 22-3 for the transmission method.
PP
Figure 22-3. Transmission Method Selection Format
10 V
V
DD
V
SS
V
DD
V
SS
Preliminary User's Manual U14581EJ3V0UM00
pulse numbers shown in Table 22-3.
PP
Note
Pin Used
SI3/P52
SO3/P51
SCK3/P50
SI2/P05
SO2/P04
SCK2/P03
RxD/P53
TxD/P54
V
pulses
PP
Flash write mode
Number of V
Pulses
PP
0
1
8
DD
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