Renesas RA Family
FPB-RA4E1 v1 – User's Manual
R20UT4958EG0100 Rev 1.00
Page 18 of 23
Sep.07.21
Figure 14. Power LED
5.4.2 User and Reset Switches
Two miniature, momentary, mechanical push-button type SMD switches are mounted on the FPB-RA4E1
board.
Pressing the reset switch (S2) generates a reset signal to restart the RA MCU.
Table 9. FPB-RA4E1 Board Switches
Designator
Function
MCU Control Port
S1
User Switch
P205 (IRQ1)
S2
MCU Reset Switch
RESET#
The User Switch S1 may be isolated from the MCU, so that the associated port can be used for other
purposes. To disconnect S1 from P205, trace cut jumper E29 must be open.
Figure 15. Reset (S2) and User Switch (S1)
5.4.3 MCU Boot Mode
A two-pin header (J7) can be fitted to select the boot mode (P201) of the RA MCU. For normal operation
(single-chip mode), leave J7 open. To enable SCI boot mode, place a jumper on J7.
Figure 16. Boot Mode Jumper (J7)
5.4.4 MCU Clocks
The board is fitted with a RA MCU sub-clock oscillator crystal, providing a precision 32,768 Hz reference
clock. The option has also been provided to fit an RA MCU oscillator crystal, providing a precision
24.000 MHz reference clock. A recommended part is the Diodes Incorporated FL2400022.
