Recommended Circuits Between The Connector And The Mcu; Connection Between The 14-Pin Connector And The Rl78 Family Mcus - Renesas E1 User Manual

E1/E20/E2/E2 Lite Additional Document
2.4

Recommended Circuits between the Connector and the MCU

This section shows recommended circuits for connection between the connector and the MCU when the
E1/E20/E2/E2 Lite is in use. For processing of signals, refer to section 2.5, Notes on Connection.
2.4.1

Connection between the 14-Pin Connector and the RL78 Family MCUs

Figure 2-5 shows a recommended circuit for connection between the 14-pin connector and the RL78
family MCUs.
14-pin
2.54-mm pitch
connector
4
RSTPU
Note 3
6
RESET_IN
Note 3
10,13
RESET_OUT
Note 3 Note 6
8
VDD
9
EVDD
5
TOOL0
2,12,14
VSS
Note 5
1,3,4,7,11
R.F.U
Figure 2-5 Example of Connection between the 14-Pin Connector and the RL78 Family MCUs
Notes: 1 The circuits and resistance values listed are recommended but not guaranteed. Determine the circuit
design and resistance values by taking into account the specifications of the target device and noise.
For flash programming for mass production, perform sufficient evaluation about whether the
specifications of the target device are satisfied.
2 For processing of pins not used by the E1/E20/E2/E2 Lite, refer to the hardware manual for the
device.
3 The recommended circuit for the RESET# pin differs depending on whether the multiplexed functions
are used. For details on how to handle the RESET# pin, also refer to section 2.5, Notes on
Connection.
4 The RESET_IN pin is used only in debugging. It is not necessary in flash programming by the
programming software.
5 Securely connect pins 2, 12, and 14 of the connection to GND of the user system. These pins are
used for electrical grounding as well as for monitoring of connection with the user system by the
E1/E20/E2/E2 Lite.
6 Securely connect both pin 10 and pin 13.
R20UT2937EJ0301 Rev.3.01
Jul 1, 2020
Note 4
Note 3
Reset circuit
1 kΩ
470 to 510 Ω
RESET#
VDD
VDD
MCU
VDD
1 kΩ
TOOL0
VSS
Note 1
Note 2
2. Designing the User System
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