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6.1.2
Circuit connection example
Refer to Figure 6-2 and design an appropriate circuit.
Caution
Target connector
RESET_OUT
RESET_IN
Notes 1. With MINICUBE2, the circuit enclosed by a dashed line is not necessary because the RxD and
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CHAPTER
6
HOW TO USE MINICUBE2 WITH 78K0R MICROCONTROLLER
The constants described in the circuit connection example are reference values.
perform flash programming aiming at mass production, thoroughly evaluate whether the
specifications of the target device are satisfied.
Figure 6-2. Recommended Circuit Connection
V
DD
1
GND
2
3
Note 1
RxD
4
VDD
5
Note 1
TxD
6
R.F.U.
7
R.F.U.
8
R.F.U.
9
R.F.U.
10
R.F.U.
11
R.F.U.
12
R.F.U.
13
R.F.U.
14
FLMD0
15
Note 3
16
CLK_IN
TxD pins are internally shorted. If any other flash programmer is used, these pins must be shorted
on the target system because these pins may not be able to be shorted in the programmer.
2. This connection is required for 2-wire communication, but not for 1-wire communication.
is left open when MINICUBE2 is not connected, so connect a pull-up or pull-down resistor to this
pin before using.
The TOOL1 pin becomes the pin that supplies a clock from the target device to MINICUBE2.
Digital noise that is synchronized with this clock may interfere with the GND power supply.
general countermeasures against noise, such as inserting a dumping resistor, as required.
a general countermeasure for noise, such as inserting a dumping resistor or performing shielding
by connecting to GND, as required.
3. This connection is designed assuming that the RESET signal is output from the N-ch open-drain
buffer (output resistance: 100Ω or less).
4. The circuit enclosed by a dashed line is not required when only flash programming is performed.
5. This is for pin processing when not used as a device.
To change this value to another resistance value, see APPENDIX A EQUIVALENT CIRCUIT.
V
DD
Note 5
3k to 10kΩ
V
DD
Note 5
1k to 10kΩ
Note 4
V
DD
1kΩ
10kΩ
For details, refer to 6.1.3
User's Manual
U18371EJ5V0UM
V
DD
Target device
GND
_RESET
TOOL0
V
DD
X1
X2
Note2
TOOL1
FLMD0
Reset connector
RESET signal
Connection of reset pin.
If you
Clock
circuit
This pin
Take
Take
141
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