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<R>
Target connector
RESET_IN
Notes 1. If there are capacitance elements such as capacitors, on-chip debugging might not operate normally.
2. A clock signal provided on the 78K0-OCD board, a 4, 8, or 16 MHz clock signal generated in MINICUBE2,
or the clock signal generated by the internal high-speed oscillator of the device can be used for the clock
signal of the target device during on-chip debugging.
Only the internal high-speed oscillator of the device can be used during flash programming.
3. During on-chip debugging, the settings specified by the user program are ignored, because these pins are
used as pins dedicated to on-chip debugging. However, if the pins are specified as input pins, the pins
must be processed (because they are left open when MINICUBE2 is not connected.)
4. This connection is designed assuming that the RESET signal is output from the N-ch open-drain buffer
(output resistance: 100 Ω or less).
5. Never connect an oscillation circuit to the 78K0-OCD board during on-chip debugging and flash
programming.
To prevent an oscillation circuit from not oscillating due to wiring capacitance when the target device
operates (when MINICUBE2 is not connected), also consider countermeasures such as disconnecting the
oscillation circuit from the target connectors by setting the jumpers.
A program that was downloaded using the debugger does not operate when MINICUBE2 is not connected.
Caution The red paths in the figure (TOOLD0 and TOOLC0) must be designed so that the device pins are less
than 30 mm from the MINICUBE2 connectors or the paths must be shielded by connecting them to
GND.
CHAPTER
4
HOW TO USE MINICUBE2 WITH 78K0 MICROCONTROLLER
Figure 4-9.
When Both Debugging and Programming Are Performed
(with X1/X2 oscillator is used, with TOOLC0/TOOLD0 communication)
1
GND
2
RESET_OUT
3
RxD
V
DD
4
V
DD
5
TxD
6
R.F.U.
7
R.F.U.
8
8
8
R.F.U.
9
Note 2
CLK
10
R.F.U.
11
R.F.U.
12
FLMD1
13
DATA
14
FLMD0
15
Note 4
16
R.F.U.
Note 5
Note 4
10 kΩ
V
DD
1 kΩ
For details, refer to 4.1.3
User's Manual
U18371EJ5V0UM
Target device
V
DD
Note 1
RESET
Note 3
TOOLD0(X2)
Note 3
TOOLC0(X1)
GND
Note 4
Note 4
Reset connector
RESET
Connection of reset pin.
V
DD
63
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