(3) M16C/80 Series
ROM external version
1 2 3 4 5 6 7 8 9 10
Vcc
Vss
TXD
RXD
SCLK
BUSY
CNVss
RESET
Vcc
BUSY
CLK
TXD
CE
EPM
GND
RESET
CNVss
RXD
Target board prepared by user
MCU peripheral circuit
MCU
Note2
Reset circuit
Note4
Note5
Note3
Serial cable
MFW1U unit
Note1
Note6
Pull-up
or
Pull-down
Diagram 3
Note 1. Power supply of the MFW1U for serial programming is provided by a user target board via
Vcc pins. Connect the power of the 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. Isolate TXD, RXD, SCLK, and/or BUSY terminals from the MCU peripheral circuit by
jumper, analog switch, three state, etc. when serial programming is achieved. Isolation
can be omitted when those signal statuses are output from the MCU peripheral circuit.
Resistance should be 4.7K
Ω
or over when pull-up is achieved to these signals.
Note 3. Connect the MCU CNVss terminal to Vss of the user target board, but do not connect to
the CNVss terminal of the MFW1U unit.
Note 4. Connect the MCU BUSY terminal to the BUSY terminal of the MFW1U unit by achieving
“pull up/down” with resistance of 10K
Ω
.
Note 5. 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.
Execute
same procedure as “Note 2” when it is “CMOS output”.
Note 6. The Vss terminal should be connected since it is signal ground.
* 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]
24
Operation Manual