(12) R8C/LX Series
1 2 3 4 5 6 7 8 9 10
Vcc
Vss
MODE
RESET
Vcc
BUSY
CLK
TXD
CE
EPM
GND
RESET
CNVss
RXD
Target board prepared by user
MCU
Note2
Reset circuit
Note3
Note5
Serial cable
S550-AD2e
Note1
MFW1U unit
Note4
Vref
Note6
Diagram 12
Note 1. Power supply of the MFW1U for serial programming is provided by a user target board via
Vcc pins. Connect the power of board to the Vcc terminal directory. Attach the AC adapter
to supply power when the current capacity of the target board is insufficient since the
maximum current consumption of the MFW1U for serial programming is 200mA. Usage
of Vcc should be 3.3V
±
5% or 5V
±
5%.
Note 2. Connect the MCU MODE terminal to the CLK terminal of the MFW1U unit by achieving
“pull up” with resistance of 4.7K
Ω
.
Note 3. Connect the reset terminal of the user target board MCU to the RESET terminal of the
MFW1U directly when the reset circuit of the user target board is “open collector output”,
“CR delay circuit”, or constant current load circuit is less than dozens of
μ
A. Isolate TXD,
RXD, and/or BUSY terminals from the MCU peripheral circuit by jumper, analog switch,
three state, etc.
when it is “CMOS output”.
Note 4.
The Vss terminal should be connected since it is signal ground.
Note 5. An exclusive programming connector ‘S550-AD1e’ or ‘S550-AD2e’ is necessary.
Note 6. Connect Vref terminal to the VCC.
* Please combine with this example of a connection circuit, and confirm a "Hardware
manual" or a "Data sheet" of each microcomputer.
Multifunctional Flash Microcomputer [S550-MFW1U]
34
Operation Manual