RH850/F1Kx, RH850/F1K Series Hardware Design Guide
R01AN3841ED0110 Rev. 1.10 Page 8 of 108
August 8, 2019
1. Power Supply
The internal circuits are separated into two independent power domains, the Always-On area (AWO area) and the
Isolated area (ISO area). The power supply of the Always-On area (AWO area) is always on in all operating modes and
stand-by modes. The power supply of the Isolated area (ISO area) can be turned off to reduce the overall power
consumption depending on the type of stand-by mode. For each power domain, a dedicated on-chip voltage regulator
generates the internal supply voltage.
1.1 Power Supply Overview of RH850/F1KM-S1
1.1.1 Power Supply Pin Overview of RH850/F1KM-S1
The devices of the RH850/F1KM-S1 have the following power supply pins:
• Power supply voltage REGVCC for the on-chip voltage regulators. The output voltage of the voltage
regulators is supplied to the digital circuits in each power domain.
• Power supply voltage EVCC for I/O ports.
• Power supply voltage A0VREF for the A/D converters and the separated I/O ports.
Table 1: RH850/F1KM-S1 Power supply pin overview
AWOVCL
Note
, AWOVSS
ISOVCL
Note
, ISOVSS
EVCC, EVSS
AWOVCL
Note
, AWOVSS
ISOVCL
Note
, ISOVSS
EVCC, EVSS
A0VREF, A0VSS
AWOVCL
Note
, AWOVSS
ISOVCL
Note
, ISOVSS
EVCC, EVSS
Note: The pins AWOVCL and ISOVCL are available on all devices to connect external stabilization capacitors. Do
not use AWOVCL and ISOVCL as power source of other devices.
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