
5.4 Connection Circuit Example for the MFW1U
Circuit diagram examples for serial programming under customer oriented MCU circuit design are
described below
(1) M16C/60([double power supplies] removed), M16C/80, M32C/80([double power supplies] removed)
, R32C/100([double power supplies] removed) Series, M16C/24 Group
1 2 3 4 5 6 7 8 9 10
Vcc
Vss
TXD
RXD
SCLK
BUSY
CE
EPM
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 1
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. Execute the same procedure as “Note 2” for CE and EPM terminals. Or only isolation
process by achieving “pull up/down” without the MFW1U connection is also applicable.
On-board direct fix is also available of the CE terminal for H level and the EPM terminal
Multifunctional Flash Microcomputer [S550-MFW1U]
20
Operation Manual