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Renesas R8C/25 Manual Do Utilizador

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Option Link Settings 
Reference 
Function 
Fitted 
Alternative (Removed) 
Related To 
R64 
CAN 
Do not use CAN function, 
R8C/25 Microcontroller do not 
have CAN function 
Do not use CAN function, 
R8C/25 Microcontroller do not 
have CAN function 
 
 
 
R66 
CAN 
Do not use CAN function, 
R8C/25 Microcontroller do not 
have CAN function 
Do not use CAN function, 
R8C/25 Microcontroller do not 
have CAN function 
 
Table 6-5: Option Links 
6.7.Oscillator Sources 
A crystal oscillator is fitted on the RSK and used to supply the main and sub clock input to the Renesas microcontroller.   
 details the oscillators that are fitted and alternative footprints provided on this RSK: 
Component 
Crystal (X1) 
Fitted 
20 MHz (HC/49U package) 
Sub clock (X2) 
Fitted   
32.768 kHz (90SMX package) 
Table 6-6: Oscillators / Resonators 
6.8.Reset Circuit 
The CPU Board includes a simple latch circuit that links the mode selection and reset circuit. This provides an easy method for swapping 
the device between Boot Mode, User Boot Mode and User mode. This circuit is not required on customers boards as it is intended for 
providing easy evaluation of the operating modes of the device on the RSK. Please refer to the hardware manual for more information 
on the requirements of the reset circuit. 
The Reset circuit operates by latching the state of the boot switch on pressing the reset button. This control is subsequently used to 
modify the mode pin states as required. 
The mode pins should change state only while the reset signal is active to avoid possible device damage. 
The reset is held in the active state for a fixed period by a pair of resistors and a capacitor. Please check the reset requirements carefully 
to ensure the reset circuit on the user’s board meets all the reset timing requirements.
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