R-IN32M3_15 Datasheet, PDF (104/105 Pages) Renesas Technology Corp – LSI for Industrial Ethernet

Instructions for the use of product
In this section, the precautions are described for over whole of CMOS device.
Please refer to this manual about individual precaution.
When there is a mention unlike the text of this manual, a mention of the text takes first priority
1.Handling of Unused Pins
Handle unused pins in accord with the directions given under Handling of Unused Pins in the manual.
-The input pins of CMOS products are generally in the high-impedance state. In operation with an unused pin in the
open-circuit state, extra electromagnetic noise is induced in the vicinity of LSI, associated shoot-through current
flows internally, and malfunctions occur due to the false recognition of the pin state as an input signal become
possible. Unused pins should be handled as described under Handling of Unused Pins in the manual.
2.Processing at Power-on
The state of the product is undefined at the moment when power is supplied.
-The states of internal circuits in the LSI are indeterminate and the states of register settings and pins are undefined
at the moment when power is supplied.
In a finished product where the reset signal is applied to the external reset pin, the states of pins are not
guaranteed from the moment when power is supplied until the reset process is completed.
In a similar way, the states of pins in a product that is reset by an on-chip power-on reset function are not
guaranteed from the moment when power is supplied until the power reaches the level at which resetting has
been specified.
3.Prohibition of Access to Reserved Addresses
Access to reserved addresses is prohibited.
-The reserved addresses are provided for the possible future expansion of functions. Do not access these
addresses; the correct operation of LSI is not guaranteed if they are accessed.
4.Clock Signals
After applying a reset, only release the reset line after the operating clock signal has become stable. When switching
the clock signal during program execution, wait until the target clock signal has stabilized.
-When the clock signal is generated with an external resonator (or from an external oscillator) during a reset, ensure
that the reset line is only released after full stabilization of the clock signal. Moreover, when switching to a clock
signal produced with an external resonator (or by an external oscillator) while program execution is in progress,
wait until the target clock signal is stable.
・ARM, AMBA, ARM Cortex, Thumb and ARM Cortex-M3 are a trademark or a registered trademark of ARM Limited
in EU and other countries.
・Ethernet is a registered trademark of Fuji Zerox Limited.
・IEEE is a registered trademark of the Institute of Electrical and Electronics Engineers, Inc.
・EtherCAT is a registered trademark of Beckhoff Automation GmbH, Germany.
・CC-Link and CC-Link IE Field are a registered trademark of CC-Link Partner Association (CLPA).
・Additionally all product names and service names in this document are a trademark or a registered trademark
which belongs to the respective owners.
・Real-Time OS Accelerator and Hardware Real-Time OS is based on Hardware Real-Time OS of “ARTESSO” made
in KERNELON SILICON Inc.