CHAPTER 6 HOW TO USE MINICUBE2 WITH 78K0R MICROCONTROLLER
User’s Manual U18371EJ1V0UM
136
6.1.2 Circuit connection example
Refer to Figure 6-2 and design an appropriate circuit.
Caution The constants described in the circuit connection example are reference values. If you perform
flash programming aiming at mass production, thoroughly evaluate whether the specifications of
the target device are satisfied.
Figure 6-2. Recommended Circuit Connection
Target device
Target connector
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
GND
RESET_OUT
RXD
Note 1
VDD
TXD
Note 1
R.F.U.
R.F.U.
R.F.U.
R.F.U.
R.F.U.
R.F.U.
R.F.U.
R.F.U.
FLMD0
RESET_IN
Note 3
CLK_IN
GND
_RESET
TOOL0
VDD
X1
X2
TOOL1
Note 2
FLMD0
Reset circuit
RESET signal
1 k
Ω
10 k
Ω
V
DD
V
DD
V
DD
Note 4
Clock
circuit
3 to 10 k
Ω
V
DD
V
DD
0 to 10 k
Ω
Target device
Target connector
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
GND
RESET_OUT
RXD
Note 1
VDD
TXD
Note 1
R.F.U.
R.F.U.
R.F.U.
R.F.U.
R.F.U.
R.F.U.
R.F.U.
R.F.U.
FLMD0
RESET_IN
Note 3
CLK_IN
GND
_RESET
TOOL0
VDD
X1
X2
TOOL1
Note 2
FLMD0
Reset circuit
RESET signal
1 k
Ω
10 k
Ω
V
DD
V
DD
V
DD
Note 4
Clock
circuit
3 to 10 k
Ω
V
DD
V
DD
0 to 10 k
Ω
Notes 1.
With MINICUBE2, the circuit enclosed by a dashed line is not necessary because the RXD and
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. This pin
is left open when MINICUBE2 is not connected, so connect a pull-up or pull-down resistor to this
pin before using.
3.
This connection is designed assuming that the RESET signal is output from the N-ch open-drain
buffer (output resistance: 100
Ω
or less). For details, refer to
6.1.3 Connection of reset pin
.
4.
The circuit enclosed by a dashed line is not required when only flash programming is performed.
