User manual

RSKRX62T 5. User Circuitry
REJ10J2194-0300 Rev.3.00 Page 15 of 40
Nov 08, 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 RX62T hardware manual for details regarding the reset signal timing requirements, and the
RSKRX62T 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 RX62T hardware manual for details regarding the clock signal requirements, and the
RSKRX62T 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 12.5MHz HC49/4U
X2 Internal RSK Testing Only Unfitted n/a n/a
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 RSKRX62T board schematics.
Switch Function MCU Connection
RES When pressed, the microcontroller is reset. RES#, Pin 10
SW1/BOOT Connects to an IRQ input for user controls. PE5, Pin 01
SW2 Connects to an IRQ input for user controls. PE4, Pin 08
SW3/ADTRG Connects to an IRQ input for user controls. The switch is also connected
to an ADTRG input, and is used to trigger AD conversions.
PB4, Pin 30
Table 5-2: Switch Connections
5.4 LEDs
There are ten LEDs on the RSK board. The function of each LED, its colour, and its connections are shown in
Table 53.
LED Colour Function MCU Connection
PWR Green Indicates the status of the 5V power rail. No connection
Boot Orange Indicates the status of the on-board programming selected No connection
LED0 Green User operated LED. P71, Pin 56
LED1 Orange User operated LED. P72, Pin 55
LED2 Red User operated LED. P73, Pin 54
LED3 Red User operated LED. P33, Pin 58
Table 5-3: LED Connections