User And Reset Switches; Mcu Boot Mode; Mcu Clocks; Figure 14. Power Led - Renesas RA4 Series User Manual

Renesas RA Family

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
S1 User Switch
S2 MCU Reset Switch
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.

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.

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.
R20UT4958EG0100 Rev 1.00
Sep.07.21

Figure 14. Power LED

MCU Control Port
P205 (IRQ1)
RESET#

Figure 15. Reset (S2) and User Switch (S1)

Figure 16. Boot Mode Jumper (J7)

FPB-RA4E1 v1 – User's Manual
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