DM300018 datasheet(98/115 Pages) MICROCHIP

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dsPICDEM 2 Development Board User’s Guide

DS51558A-page 92

14.1.8

External Interrupt Switches

Switches S5 and S6 can be connected to the external interrupt pins, INT0 and INT1,

respectively on all supported dsPIC30F devices. Switches S5 and S6 are connected to

the dsPIC DSC device through headers H6 and H7, respectively. The signal lines are

normally pulled up to +5V DC through 4.7 kOhm resistors. Pressing the switch will short

the line to ground.

Table 14-4 lists the connections set up by the jumper positions on headers H6 and H7.

The schematic of the pushbutton switches and selection headers that comprise the

simulated external interrupt circuits is shown in Figure A-7: “dsPICDEM™ 2

Development Board Schematic (Sheet 6 of 7)”.

14.1.9

LED Indicators

Two LEDs D3 and D4 are provided on the dsPICDEM 2 Development Board. These

may be useful in monitoring the status of your application. The LEDs, D3 and D4, are

connected to port pins, RB0 and RB1, on the dsPIC30F devices, respectively. These

LEDs will illuminate if a high signal is fed to them, but will turn off on a low signal.

Header H12 is used to connect the LEDs, D3 and D4, into the circuit. If the jumper is

installed to connect the GP pins, the LED is connected to the General Purpose and

Sensor family device sockets (U1A1, U1B1 and U1C1). If the jumper on H12 is installed

to connect the M ALL pins, the LED is connected to the motor control device sockets

(U2A1 and U2B1).

The schematic of the LED indicator circuits is shown in Figure A-7: “dsPICDEM™ 2

Development Board Schematic (Sheet 6 of 7)”.

TABLE 14-5:

EXTERNAL INTERRUPT HEADER SETTINGS

Header(1)

Pin Position

Function(2)

GP 40

Connects switch S5 to Port pin RA11of the 40-pin dsPIC30F

device in general purpose socket U1A1 to signify external

interrupt INT0.

GP 28

Connects switch S5 to Port pin RF6 of the 28-pin dsPIC30F

device in general purpose socket U1B1 to signify external

interrupt INT0.

GP 18

Connects switch S5 to Port pin RB6 of the 18-pin dsPIC30F

device in general purpose socket U1C1 to signify external

interrupt INT0.

M ALL

Connects switch S5 to Port pin RE8 of the dsPIC30F device in

either motor control socket to signify external interrupt INT0.

GP 40/28

Connects switch S6 to Port pin RD8 of the 28 or 40-pin

dsPIC30F device in general purpose socket U1B1 or U1A1 to

signify external interrupt INT1.

GP 18

Connects switch S6 to Port pin RD0 of the 18-pin dsPIC30F

device in general purpose socket U1C1 to signify external

interrupt INT1.

M ALL

Connects switch S6 to Port pin RD0 of the dsPIC30F device in

either motor control socket to signify external interrupt INT0.

Note 1:

Header H6 selects switch S5 (INT0). Header H7 selects switch S6 (INT1).

Indicates the path established when jumper is installed in that position.

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