User Circuitry; Reset Circuit; Clock Circuit; Switches - Renesas RX100 Series User Manual

Renesas Starter Kit for RX140

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 RX140 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 RX140 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 Table 5-1
below.
Crystal
X1 Main MCU crystal for RX140
X2 Real time Clock for RX140
X3 Main MCU crystal for RL78/G1C

5.3 Switches

There are four switches located on the CPU board. The function of each switch and its connection is shown in
Table 5-2. For further information regarding switch connectivity, refer to the CPU board schematics.
Switch
RES When pressed, the microcontroller is reset.
SW1 Connects to an IRQ1 input for user controls.
SW2 Connects to an IRQ2 input for user controls.
Connects to an IRQ6 input for user controls.
SW3
Connects to an ADTRG0 input for ADC controls.
R20UT5026EG0100 Rev.1.00
Jan 17, 2022
Table 5-1: Crystal
Function
Table 5-2: Push Switch Connections
Function
Default Placement Frequency
Fitted 8MHz
Fitted 32.768kHz
Fitted 12MHz
Signal (Port)
5. User Circuitry
Device Package
Encapsulated, SMT
Encapsulated, SMT
Encapsulated, SMT
MCU
Pin
RES# 9
P31 17
P32 16
P16 24
Page 18 of 43