S124 Datasheet, PDF (97/98 Pages) Renesas Technology Corp – 32-bit ARM Cortex-M0+ microcontroller

General Precautions in the Handling of Microprocessing Unit and Microcontroller Unit Products
1. Precaution against Electrostatic Discharge (ESD)
A strong electrical field, when exposed to a CMOS device, can cause destruction of the gate oxide and ultimately degrade the device
operation. Steps must be taken to stop the generation of static electricity as much as possible, and quickly dissipate it when it occurs.
Environmental control must be adequate. When it is dry, a humidifier should be used. This is recommended to avoid using insulators
that can easily build up static electricity. Semiconductor devices must be stored and transported in an anti-static container, static
shielding bag or conductive material. All test and measurement tools including work benches and floors must be grounded. The
operator must also be grounded using a wrist strap. Semiconductor devices must not be touched with bare hands. Similar precautions
must be taken for printed circuit boards with mounted semiconductor devices.
2. Processing at power-on
The state of the product is undefined at the time 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 time 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 time 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 time when power is supplied until the power reaches the level at which resetting is specified.
3. Input of signal during power-off state
Do not input signals or an I/O pull-up power supply while the device is powered off. The current injection that results from input of
such a signal or I/O pull-up power supply may cause malfunction and the abnormal current that passes in the device at this time may
cause degradation of internal elements. Follow the guideline for input signal during power-off state as described in your product
documentation.
4. Handling of unused pins
Handle unused pins in accordance 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 the LSI, an associated shoot-through current flows internally, and malfunctions occur due to the false
recognition of the pin state as an input signal become possible.
5. Clock signals
After applying a reset, only release the reset line after the operating clock signal becomes stable. When switching the clock signal
during program execution, wait until the target clock signal is 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.
Additionally, 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.
6. Voltage application waveform at input pin
Waveform distortion due to input noise or a reflected wave may cause malfunction. If the input of the CMOS device stays in the area
between VIL (Max.) and VIH (Min.) due to noise, for example, the device may malfunction. Take care to prevent chattering noise
from entering the device when the input level is fixed, and also in the transition period when the input level passes through the area
between VIL (Max.) and VIH (Min.).
7. Prohibition of access to reserved addresses
Access to reserved addresses is prohibited. The reserved addresses are provided for possible future expansion of functions. Do not
access these addresses as the correct operation of the LSI is not guaranteed.
8. Differences between products
Before changing from one product to another, for example to a product with a different part number, confirm that the change will not
lead to problems. The characteristics of a microprocessing unit or microcontroller unit products in the same group but having a
different part number might differ in terms of internal memory capacity, layout pattern, and other factors, which can affect the ranges
of electrical characteristics, such as characteristic values, operating margins, immunity to noise, and amount of radiated noise. When
changing to a product with a different part number, implement a system-evaluation test for the given product.