Chapter 6. User Circuitry
6.1. Switches
There are four switches located on the RSK. The function of each switch and its connection are shown in Table 6-1.
Switch
Function
Microcontroller
RES
When pressed, the RSK microcontroller is reset.
RESET Pin8
SW1/BOOT* Connects to an IRQ input for user controls.
The switch is also used in conjunction with the RES switch to place
the device in BOOT mode when not using the E8a debugger.
INT0 Pin27
(Port 4, pin 5)
SW2*
Connects to an IRQ Interrupt input line for user controls.
INT1 Pin21
(Port 1, pin 7)
SW3*
Connects to a Key In Interrupt input line for user controls
KI3 Pin25
(Port 1, pin 3)
Table 6-1: Switch Functions
*Refer to schematic for detailed connectivity information.
6.2. LEDs
There are six LEDs on the RSK board. The green ‘POWER’ LED lights when the board is powered. The orange BOOT LED indicates the
device is in BOOT mode when lit. The four user LEDs are connected to an IO port and will light when their corresponding port pin is set low.
Table 6-2, below, shows the LED pin references and their corresponding microcontroller port pin connections.
LED Reference (As
shown on silkscreen)
Colour
Microcontroller Port Pin function
Microcontroller Pin
Number
LED0
Green
Port 2.4
16
LED1 Orange
Port
2.5
15
LED2 Red
Port
2.6
14
LED3 Red
Port
2.7
13
Table 6-2: LED Port
6.3. Potentiometer
A single turn potentiometer is connected to AN8 (P1.0) of the microcontroller. This may be used to vary the input analogue voltage value to
this pin between VREF and Ground.
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