Renesas Starter Kit+ for RX72N
5. User Circuitry
R20UT4443EG0100 Rev. 1.00
Page 18 of 57
Nov 30, 19
5. User Circuitry
5.1
Reset Circuit
A reset control circuit is fitted to the CPU board to generate the required reset signal, and is triggered from the
RES switch. Refer to the RX72N Group User’s Manual: Hardware for details regarding the reset signal timing
requirements, and the CPU board schematics for information regarding the reset circuitry in use on the board.
5.2
Clock Circuit
A clock circuit is fitted to the CPU board to generate the required clock signal to drive the MCU, and
associated peripherals. Refer to the RX72N Group Hardware Manual and the RL78/G1C hardware manual for
details regarding the clock signal requirements, and the CPU board schematics for information regarding the
clock circuitry in use on the CPU board. Details of the oscillators fitted to the board are listed in
below.
Table 5-1: Crystal
Crystal
Function
Default Placement Frequency
Device Package
X1
Main MCU crystal for RX72N
Fitted
24MHz
Encapsulated, SMT
X2
Real time Clock for RX72N
Fitted
32.768kHz Encapsulated, SMT
X3
Main MCU crystal for RL78/G1C
Fitted
12MHz
Encapsulated, SMT
X4
Crystal for Ethernet (RMII)
Fitted
50MHz
Encapsulated, SMT
5.3
Switches
There are five switches located on the CPU board. The function of each switch and its connection is shown in
and Table 5-3
. For further information regarding switch connectivity, refer to the CPU board
schematics.
Table 5-2: Push Switch Connections
Switch
Function
MCU
Signal (Port)
Pin
RES
When pressed, the microcontroller is reset.
RES#
G7
SW1
Connects to an IRQ13-DS input for user controls.
P45
D1
SW2
Connects to an IRQ12-DS input for user controls.
P44
C4
SW3
Connects to an IRQ15 input for user controls.
Connects to an ADTRG0 input for ADC controls.
P07
E5
Table 5-3: DIP Switch Connections
Switch
Function
MCU
Signal (Port)
Pin
SW4
Pin 1
Refer to section 6.2 for the setting contents.
MD/FINED
G4
SW4
Pin 2
Refer to section 6.2 for the setting contents.
PC7
N9
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