(5) M16C/1N Group
1 2 3 4 5 6 7 8 9 10
Vcc
Vss
TXD
RXD
SCLK
BUSY
CE
CNVss
RESET
Vcc
BUSY
CLK
TXD
CE
EPM
GND
RESET
CNVss
RXD
Target board prepared by user
MCU peripheral circuit
MCU
Note2
Reset circuit
Note5
Note6
Note3
Serial cable
MFW1U unit
Note1
Note7
Note4
SEL
Diagram 5
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 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 I/O 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. Execute the same procedure as “Note 2” for CE terminal. Or only isolation process by
achieving “pull up” without the MFW1U connection is also applicable. On-board direct fix
is also available of the CE terminal for H level when these terminals are not connected.
Note 4. Execute the same procedure as “Note 2” for SEL terminal. Or only isolation process by
achieving “pull down” without the MFW1U connection is also applicable. On-board direct
fix is also available of the SEL terminal for L level when these terminals are not
connected.
Note 5. Connect the MCU CNVss terminal to the CNVss terminal of the MFW1U unit by
achieving “pull up/down” with resistance of 4.7K
Ω
. H-level fixation by jumper switching
is also available. Attachment to the MFW1U is not needed for this case.
Note 6. 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 the
same procedure as “Note 2” when it is “CMOS output”.
Multifunctional Flash Microcomputer [S550-MFW1U]
26
Operation Manual
