User manual

RSK+RX62N 5. User Circuitry
REJ10J2198-0201 Rev. 2.01 Page 16 of 54
Nov 30, 2011
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 RX62N hardware manual for details regarding the reset signal timing requirements, and the
RSK+RX62N board schematics for information regarding the reset circuitry in use on the RSK.
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 RX62N hardware manual for details regarding the clock signal requirements, and the
RSK+RX62N board schematics for information regarding the clock circuitry in use on the RSK. Details of the
oscillators fitted to the RSK are listed in Table 5-1 below.
Crystal Function Default Placement Frequency Device Package
X1 Main MCU oscillator. Fitted 12MHz HC49/4U
X2 Internal RSK Testing Only Unfitted n/a n/a
X3 Real time Clock Fitted 32.768kHz Encapsulated, SMT
X4 Ethernet Clock Fitted 25MHz HC49/4U
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+RX62N board schematics.
Switch Function MCU Connection
RES When pressed, the microcontroller is reset. RES#, Pin H4
SW1 Connects to an IRQ input for user controls. IRQ8-A, Pin C1
SW2 Connects to an IRQ input for user controls. IRQ9-A, Pin D2
SW3/ADTRG Connects to an IRQ input for user controls. The switch is also connected
to an ATRG input, and is used to trigger AD conversions.
IRQ15-A/ADTRG0#,
Pin C4
Table 5-2: Switch Connections