PICAXE Manual Section 1 - TechnoPujades - Free

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www.picaxe.co.ukSection 1 80GETTING STARTEDAppendix C – Configuring the PICAXE-14M Input-Output PinsPICAXE-14M (advanced use)+VSerial InADC4 / Input 4Infrain / Input 3PWM 2 / hpwm A / Out C5 / In C5 / Input 2hpwm B / Out C4 / In C4 / Input 1ADC0 / hpwm C / Out C3 / In C3 / Input 012345671413121110980VOutput 0 / Serial Out / InfraoutOutput 1Output 2Output 3 / Out C0 / In C0 / ADC1Output 4 / Out C1 / In C1 / ADC2Output 5 / Out C2 / In C2 / ADC3 / hpwm DThe PICAXE-14M is a very versatile device. In it’s default state, which is designedprimarily for educational use, it has a simple, clean ‘inputs on left’ - ‘outputs onright’ layout.However more advanced users can re-configure the bottom 3 pins on each side tobe either inputs or outputs. This has added advantages as follows:- more flexible quantity of inputs and outputs- more ADC channels become available- the option to use pwmout via the pwmout and hpwm commandsThe diagram above shows the advanced function of each pin. The 6 pins arearranged in a ‘port’ (portC) with bits labelled C0-C5. Note that the portC bitnumbers do not correspond to the normal input/output numbers (or even the legnumbers!). Study the pinout diagram very carefully!Using portc pins as outputsAny portc pin can be configured to be used as a digital output.To convert the pin C3 to output and make it highhigh portc 3To convert the pin C3 to output and make it lowlow portc 3To convert all the pins to outputslet dirsc = %00111111To convert all the pins to inputslet dirsc = %00000000It is not possible to access the portc pins C3-C5 with any other ‘output’ typecommands (serout, pulsout etc). Therefore when used as outputs these pinsshould be reserved as simple on/off outputs. Remember that C0-C2 are normaloutputs (3-5) anyway, and so can be used with any output command.revolution(c) Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.ukVersion 6.9 07/2009All rights reserved.80
www.picaxe.co.ukSection 1 81GETTING STARTEDUsing portc as digital inputsThe portc pins C0, C1, C2 are, by default, configured as outputs. They canhowever be reconfigured as inputs, but you must ensure your hardware designallows for the fact that the pin will be an output upon powerup. A simple 1kresistor in series with the pin will normally resolve this issue.To make the pin an input you must use ‘let dirsc = ‘ as described above.The following syntax is used to test the input condition:if portC pin0 = 1 then jumpi.e. the additional keyword ‘portC’ is inserted after the ‘if’ command.to test if two (or more) portc inputs are onif portC pin0 = 1 AND pin1 = 1 then jumpto test if either of two (or more) portc inputs are onif portC pin0 = 1 OR pin1 = 1 then jumpNote the portc command is only required once after the ‘if’ command.It is not possible to test inputs on two different ports within the same if…thenstatement.It is not possible to access the portc pins with any other ‘input’ type commands(count, pulsin etc). Therefore these pins should be reserved as simple on/offswitches.Note that ‘dirsc’ uses the common BASIC notation 0 for input and 1 for output.Using portc as analogue inputsThree additional ADC pins, ADC1,2,3, are available AFTER the corresponding pinhas been converted to an input. You must ensure your hardware design allows forthe fact that the pin will be an output upon powerup. A simple 1k resistor inseries with the pin will normally resolve this issue.Using portc as pwm outputsC5 can be used with the pwmout command, but will make this pin an output.Pins C2-5 (hpwm A-D) can all be used with the hpwm command, but will alsomake the corresponding pins outputs.Special Note - Output Pin 0Pin 0 (leg 13) is used during the program download, but can also be used as anormal output once the download is complete. Therefore you must rememberthat your output device will rapidly switch on and off as the download takesplace (not a problem with simple outputs like LEDs, but could cause problemswith other devices such as motors).revolution(c) Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.ukVersion 6.9 07/2009All rights reserved.81
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