Renesas RX23T Series, User Manual

Page: 19 / 41

RSKRX23T 5. User Circuitry
R20UT3318EG0100
Rev.
1.00
Page 18 of 40
Aug 24, 2015
5. User Circuitry
5.1 Reset Circuit
A reset control circuit is fitted to the RSK to generate a reset signal from the RES switch. Refer to the RX23T
hardware manual for details regarding the reset signal timing requirements, and the RSK schematics for
information regarding the reset circuitry in use on the board.
5.2 Clock Circuit
A clock circuit is fitted to the RSK to generate the required clock signal to drive the MCU, and associated
peripherals. Refer to the RX23T Group Hardware Manual for details regarding the clock signal requirements,
and the RSKRX23T board schematics for information regarding the clock circuitry in use on the RSK. Details
of the oscillators fitted to the board are listed in
Table 5-1 below.
Crystal Function Default Placement Frequency Device Package
X1 RX23T Main oscillator. Fitted 20MHz Encapsulated, SMT
X2 RL78/G1C Main oscillator Fitted 12MHz Encapsulated, SMT
Table 5-1: Oscillators
5.3 Switches
There are four switches located on the RSK board. The function of each switch and its connection is shown in
Table 5-2 . For further information regarding switch connectivity, refer to the RSK schematics.
Switch Function
MCU
Signal (Port) Pin
RES When pressed, the microcontroller is reset RES# 6
SW1 Connects to an IRQ input for user controls IRQ5 (PD6) 13
SW2 Connects to an IRQ input for user controls. IRQ2 (P00) 2
SW3
Connects to an IRQ input for user controls.
*1
IRQ1 (P94) 29
Connects to an ADTRG input. ADTRG0# (PA4) 64
Table 5-2: Switch Connections
*1
: This connection is a not available in the default RSK configuration - refer to §6 for the required
modifications.