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Chapter 6.User Circuitry

6.1.Switches

There are four switches located on the CPU board. The function of each switch and its connection are shown in Table 6-1.

Switch Function Microcontroller

RES When pressed; the CPU board microcontroller is reset. RESn

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 E8 debugger.

IRQ0n, Pin 84

(Port 1, pin 0)

SW2* Connects to an IRQ line for user controls. IRQ1n , Pin 85

(Port 1, pin 1)

SW3* Connects to the ADC trigger input. Option link allows connection to

IRQ line. The option is a pair of 0R links (R56, R95).

IRQ3n, Pin 87

(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 CPU 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)

Microcontroller Port Pin

function

Microcontroller Pin

Number

Polarity

LED0 Port B3 3 Active Low

LED1 Port C2 116 Active Low

LED2 Port C3 117 Active Low

LED3 Port 12 86 Active Low

Table 6-2:LED Port

6.3.Potentiometer

A single turn potentiometer is connected to AN0 of the microcontroller. This may be used to vary the input analog voltage value to this pin

between AVCC and Ground.

6.4.Serial port

The microcontroller programming serial port (SCI4) is connected to the E8 connector (J6). This serial port can optionally be connected to

the RS232 transceiver by moving option resistors and fitting the D connector in position J8. The connections to be moved are listed in the

following table.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 38 39

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