E1 Datasheet, PDF (27/50 Pages) Renesas Technology Corp – E1/E20 Emulator

E1/E20 Emulator
Designing the User System
2.5. Notes on Connection
Wiring patterns between the connector and the MCU must be as short as possible (within 50 mm is recommended).
Do not connect the signal lines between the connector and MCU to other signal lines.
For the handling of pins while the E1 or E20 emulator is not in use, refer to the hardware manual for the MCU.
2.5.1. About the RES# Pin
The emulator uses the RES# pin.
If the user system includes a user logic reset circuit, the output signal from the reset circuit must be connected to
the RES# pin of the connector via an open-collector buffer as shown below. If there is no reset circuit, on the other
hand, the RES# pin of the connector must be directly connected to the RES# pin of the MCU.
When you use hot plug-in, install a ceramic capacitor (approx. 0.1 µF) between the RES# pin and GND in order to
suppress a noise to the RES# pin that would occur when the emulator is connected.
Hot plug-ins are not available if there is no reset circuit.
[When hot plug-in is not used]
- When a reset circuit is included
VCC
Connector
RES#
Reset
circuit
Open-collector
buffer
4.7kΩ to 10 kΩ
RES#
MCU
- When a reset circuit is not included
Connector
RES#
VCC
4.7kΩ to 10 kΩ
MCU
RES#
[When hot plug-in is used]
- When a reset circuit is included
Connector
RES#
Reset
circuit
Open-collector
buffer
VCC
4.7kΩ to 10 kΩ
RES#
0.1uF
MCU
Figure 2.16 Connection of the Reset Circuit
Do not install capacitors, series resistors, or filters on signal lines; if attempted, correct communication may not
be established.
R20UT0399EJ0700 Rev.7.00
Feb 01, 2014
Page 27 of 50