NEC MINICUBE2, User Manual

Page: 21 / 170

CHAPTER 3 HOW TO USE MINICUBE2 WITH V850 MICROCONTROLLER
User’s Manual U18371EJ1V0UM
21
Figure 3-2. Recommended Circuit Connection When UART Is Used for Communication Interface
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.
CLK Note 2
R.F.U.
R.F.U.
FLMD1 Note 3
R.F.U.
FLMD0 Note 3
RESET_IN Note 4
R.F.U.
GND
_RESET
TXD
VDD
RXD
X1
X2
FLMD1
FLMD0
Reset connector
RESET signal
10 k Ω
100 Ω
1 k Ω 10 k Ω
Note 6 1 to 10 k
Ω
Port X
1 to 10 k Ω
3 to 10 k Ω
V
DD
V
DD
V
DD
V
DD
Note 5
Clock
circuit
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.
CLK Note 2
R.F.U.
R.F.U.
FLMD1 Note 3
R.F.U.
FLMD0 Note 3
RESET_IN Note 4
R.F.U.
GND
_RESET
TXD
VDD
RXD
X1
X2
FLMD1
FLMD0
Reset connector
RESET signal
10 k Ω
100 Ω
1 k Ω 10 k Ω
Note 6 1 to 10 k
Ω
Port X
1 to 10 k Ω
3 to 10 k Ω
V
DD
V
DD
V
DD
V
DD
Note 5
Clock
circuit
Notes 1. Connect TxD (transmit side) of the target device to RxD (receive side) of the target connector, and TxD
(transmit side) of the target connector to RxD (receive side) of the target device. Read the serial interface
pin names on the target device side as those for flash programming supported by the target device.
2. This pin may be used to supply an external clock during flash programming (4, 8 or 16 MHz). For the
connection, refer to the user
'
s manual for the target device.
3. The alternate function of this pin can be used because this pin goes to Hi-Z when debugging.
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). For details, refer to 3.1.3 Connection of reset pin .
5. The circuit enclosed by a dashed line is not required when only flash programming is performed.
6. The circuit enclosed by a dashed line is designed for flash self programming, which controls the FLMD0
pin via ports. Use the port for inputting or outputting the high level. When flash self programming is not
performed, a pull-down resistance for the FLMD0 pin can be within 1 to 10 k
Ω
.