RH850/F1K Series Hardware Design Guide
R01AN2911EJ0100 Rev. 1.00 Page 17 of 46
Aug 04, 2016
4. Device Pins
4.1 RESET
4.1.1 Minimum RESET Circuit
The RH850/F1K series has an on-chip Power-on Clear (POC) circuit. Therefore, a specific external RESET circuit is
not required and the minimum requirement of the RESET circuit is a resistor to EVCC for start-up of the device. The
resistor should be dimensioned large enough to allow a RESET signal generated by development tool or flash
programmer to control the RESET pin.
In addition, a capacitor should be added as protection against surges.
Figure 7 Minimum RESET circuit
General guidance values of the minimum RESET circuit:
Table 11 Guidance values for the minimum RESET circuit
The series resistor R2 is optional to suppress external signals from EMC point of view and depends on the application
requirements.
The capacitor C1 can be adopted to a different value when the AC specification of the RESET (terminal) timing, the AC
specification of the serial programmer setup timing and the EMC requirements of the ECU are fulfilled.
For further layout, related recommendations please refer to the application note “PCB-Design for Improved EMC”
(R01AN0733EDxxxx).
RESET
EVCC
RH850/F1x
Development Tool,
Flash Programmer
R1
C1
R2
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