Renesas RA Family
FPB-RA4E1 v1 – User's Manual
R20UT4958EG0100 Rev 1.00
Page 10 of 23
Sep.07.21
Location
Circuit Group
Default
Open/Closed
Function
E7
I
2
C SCL0
Closed
Connects SCL0 (P400) to 2.2K pull-up R1
E8
I
2
C SDA0
Closed
Connects SDA0 (P401) to 2.2K pull-up R2
E9
LED2
Closed
Connects LED2 to P407
E10
LED1
Closed
Connects LED1 to P408
E11
MCU Power
Closed
Connects AVCC0 (MCU pin 56) to VREFH (MCU pin 55)
E12
MCU Clock
Closed
Connects (J3 pin 14) to MCU pin 10 (P212/EXTAL)
E13
MCU Clock
Open
Connects 24MHz crystal to MCU pin 10 (P212/EXTAL)
E14
MCU Power
Closed
Connects AVCC0 (MCU pin 56) to +3.3 V
E15
MCU Clock
Open
Connects 24MHz crystal to MCU pin 9 (P213/XTAL)
E16
MCU Power
Closed
Connects AVSS0/VREFL (MCU pin 57) to GND
E17
MCU Clock
Closed
Connects J3 pin 13 to MCU pin 9 (P213/XTAL)
E18
MCU Power
Closed
Connects VREFLO (MCU pin 58) to AVSS0/VREFL
(MCU pin 57)
E19
MCU Power
Closed
Connects AVCC0 (MCU pin 56) to VREFH0 (MCU pin
59)
E20
MCU Clock
Closed
Connects J3 pin 11 to MCU pin 7 (XCOUT)
E21
MCU Power
Open
Connects Arduino J1 pin 8 to VREFH0 (MCU pin 59)
E22
MCU Clock
Open
Connects 32.768KHz crystal to MCU pin 7 (XCOUT)
E23
MCU Clock
Open
Connects 32.768KHz crystal to MCU pin 6 (XCIN)
E24
MCU Clock
Closed
Connects J3 pin 10 to MCU pin 6 (XCIN)
E25
MCU Power
Open
Bypass diode D1 to connect J3 pin 8 directly to MCU pin
4 (VBATT)
E26
MCU Power
Closed
Connects MCU pin 4 (VBATT) to +3.3 V
E28
Debugger
Closed
Connects P201/MD to P300/TCK/SWCLK
E29
Switch S1
Closed
Connects User Switch 1 to MCU P205
E30
Debugger
Open
Connects the debugger reset pin to ground to disable the
debugger
J7
MCU Boot Mode
Open
Closed
Configures the MCU for Single-chip mode
Configures the MCU for SCI boot mode
R3
MCU Power
Fitted
Co3.3 V to MCU. Remove when testing MCU
current draw
5. System Control and Ecosystem Access
The FPB-RA4E1 provides a power supply regulator, an on-board debugger, simple I/O (switches and LEDs),
and popular I/O ecosystem connectors. These are all described in detail below.
5.1 Power
The FPB-RA4E1 board is designed for +5 V operation. An on-board Low Dropout (LDO) regulator is used to
convert the 5 V supply to a 3.3 V supply. The 3.3 V supply is used to power the RA MCU and other
peripheral features.
