Renesas RSKRX111, User Manual

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RSKRX111 5. User Circuitry
R20UT2193EG0200 Rev. 2.00 Page 14 of 42
Apr 14, 2014
5. User Circuitry
5.1 Reset Circuit
A reset control circuit is fitted to the RSK to generate the required reset signal, and is triggered from the RES
switch. Refer to the RX111 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 RX111 Group Hardware Manual for details regarding the clock signal requirements,
and the RSKRX111 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 Main MCU oscillator. Fitted 16MHz Encapsulated, SMT
X2 RX111 Sub oscillator Fitted 32.768kHz * Encapsulated, SMT
X3 RL78/G1C Main oscillator Fitted 12MHz Encapsulated, SMT
Table 5-1: Oscillators
* The Sub clock oscillator drive circuit is low power to achieve excellent standby power consumption. The
Crystal and associated capacitors must have a capacitance equal or less than 6pF to ensure this oscillator is
accurate. The oscillator will function at higher loads, but operation to specification is not guaranteed.
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# 7
SW1 Connects to an IRQ input for user controls. IRQ0 (P30) 4
SW2 Connects to an IRQ input for user controls. IRQ1 (P31) 5
SW3 Connects to an IRQ input for user controls. The switch is
also connected to an ADTRG input, and is used to trigger
AD conversions. IRQ4 (PE4) 47
ADTRG0# (PB0)
39
Table 5-2: Switch Connections