Renesas R5S72623 User Manual

Page iv of xl 

 

R01UH0134EJ0400  Rev. 4.00 

 

 Sep 

24, 

2014 

1.  Treatment of NC Pins 

Note:  Do not connect anything to the NC pins. 

The NC (not connected) pins are either not connected to any of the internal circuitry or are 
used as test pins or to reduce noise. If something is connected to the NC pins, the 
operation of the LSI is not guaranteed. 

2.  Treatment of Unused Input Pins 

Note:  Fix all unused input pins to high or low level. 

Generally, the input pins of CMOS products are high-impedance input pins. If unused pins 
are in their open states, intermediate levels are induced by noise in the vicinity, a pass-
through current flows internally, and a malfunction may occur. 

3. Processing before Initialization 

Note:  When power is first supplied, the product's state is undefined.  

The states of internal circuits are undefined until full power is supplied throughout the 
chip and a low level is input on the reset pin. During the period where the states are 
undefined, the register settings and the output state of each pin are also undefined. Design 
your system so that it does not malfunction because of processing while it is in this 
undefined state. For those products which have a reset function, reset the LSI immediately 
after the power supply has been turned on. 

4.  Prohibition of Access to Undefined or Reserved Addresses 

Note:  Access to undefined or reserved addresses is prohibited. 

The undefined or reserved addresses may be used to expand functions, or test registers 
may have been be allocated to these addresses. Do not access these registers; the system's 
operation is not guaranteed if they are accessed.