PICAXE Manual Section 1 - TechnoPujades - Free

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www.picaxe.co.ukSection 1 40GETTING STARTEDAll parts default to 4MHz internal operation, apart from the X2 parts whichdefault to 8MHz internal operation.If desired the PICAXE can be ‘over-clocked’ by use of an 8MHz or 16MHzresonator. See the ‘Over-clocking’ section for more details.The 28X2 and 40X2 contain an internal 4xPLL circuit. This means that theinternal operating frequency is 4x the external resonator frequency. Themaximum speed of these devices is therefore 64MHz (using a 16MHz resonator).If desired a 2 pin resonator, or 2 pin crystal, can be used with X, X1 or X2 parts. Inthis case two appropriate loading capacitors must also be used with theresonator/crystal. See the crystal manufacturer’s datasheet for more information.revolution(c) Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.ukVersion 6.9 07/2009All rights reserved.40
www.picaxe.co.ukSection 1 41GETTING STARTEDTesting the SystemThis first simple program can be used to test your system. It requires theconnection of an LED (and 330R resistor) to output pin 4. If connecting the LEDdirectly to a PICAXE chip on a proto (or home-made) board, connect the LEDbetween the output pin and 0V. When using the project boards (e.g. as suppliedwithin the 18 and 28 starter packs), connect the LED between V+ and the outputconnector, as the output is buffered by the darlington driver chip on the projectboard. (Make sure the LED is connected the correct way around!).output pin 4V+330R330R0Vproject boardoutput 4connection1. Connect the PICAXE cable to the computer USB/serial port. Note which portit is connected to (e.g. COM1 or COM2).2. Start the Programming Editor software.3. Select View>Options to select the Options screen (this may automaticallyappear).4. Click on the ‘Mode’ tab and select the correct PICAXE type.5. Click on the ‘Serial Port’ tab and select the serial port (virtual COM port forUSB cable) that the PICAXE cable is connected to.6. Click ‘OK’7. Type in the following program:main: high 4pause 1000low 4pause 1000goto main(NB note the colon (:) directly after the label ‘main’ and the spaces betweenthe commands and numbers)8. Make sure the PICAXE circuit is connected to the serial cable, and that thebatteries are connected. Make sure the LED and 330R resistor are connectedto output 4.9. Select PICAXE>RunA download bar should appear as the program downloads. When thedownload is complete the program should start running automatically – theLED on output 4 should flash on and off every second.If your program does not download use the check list and hard-reset proceduredescribed in the next two sections to isolate the mistake.revolution(c) Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.ukVersion 6.9 07/2009All rights reserved.41
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PICAXE Manual Section 1 - TechnoPujades - Free

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