PICAXE Manual Section 1 - TechnoPujades - Free

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www.picaxe.co.ukSection 1 84GETTING STARTEDAppendix E – Configuring PICAXE-28X / 28X1 Input-Output PinsTo provide greater flexibility, the input /output pin configuration of the PICAXE-28Xcan be varied by the user.The default power up settings are the same asthe other PICAXE-28 parts (8 in, 8 out, 4analogue).PORTA (legs 2 to 5) provide 4 analogueinputs (default) or up to 4 digital inputs.PORTB (leg 21 to 28) provide 8 fixedoutputs.PORTC (leg 11 to 18) provide 8 digitalinputs (default) or up to 8 outputs.ResetC1- / ADC0 / A.0C2- / ADC1 / A.1C2+ / ADC2 / A.2C1+ / ADC3 / A.3Serial InSerial Out / A.40VResonatorResonatortimer clk / C.0pwm 1 / C.1(hpwm A) / pwm 2 / C.2i2c scl / spi sck / C.3PICAXE-28X2This gives a maximum of 12 digital inputs, 16 outputs and 4 analogue inputs12345678910111213142827262524232221201918171615B.7B.6B.5B.4 / ADC11 / (hpwm D)B.3 / ADC9B.2 / ADC8 / INT2 / (hpwm B)B.1 / ADC10 / INT1 / (hpwm C)B.0 / ADC12 / INT0+V0VC.7 / hserin / kb dataC.6 / hserout / kb clkC.5 / spi sdoC.4 / i2c sda / spi sdiPORTA FunctionsLeg Default Function Second Function2 analogue 0 porta input 03 analogue 1 porta input 14 analogue 2 porta input 25 analogue porta input 3PORTB FunctionsPORTB pins are fixed as outputs and cannot be altered.PORTC FunctionsLeg Default Second Function Special Function11 input 0 output portc 0infrared (input)12 input 1 output portc 1pwm 1 (output)13 input 2 output portc 2pwm 2 (output)14 input 3 output portc 3i2c scl clock (input)15 input 4 output portc 4i2c sda data (input)16 input 5 output portc 517 input 6 output portc 6keyboard clock (input)18 input 7 output portc 7keyboard data (input)The portC pins can be used as the default inputs, changed to outputs, or usedwith their special function via use of the infrain, keyin, i2cslave, or pwmoutcommand as appropriate.revolution(c) Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.ukVersion 6.9 07/2009All rights reserved.84
www.picaxe.co.ukSection 1 85GETTING STARTEDUsing porta as digital inputsThe porta pins 0 to 3 (legs 2 to 5) are, by default, configured as analogue inputs.However they can also be used as simple digital inputs.The following syntax is used to test the input condition:if portA pin0 = 1 then jumpi.e. the additional keyword ‘portA’ is inserted after the ‘if’ command.to test if two (or more) porta inputs are onif portA pin0 = 1 AND pin1 = 1 then jumpto test if either of two (or more) porta inputs are onif portA pin0 = 1 OR pin1 = 1 then jumpNote the portA 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 portA pins with any other ‘input’ type commands(count, pulsin etc). Therefore these pins should be reserved as simple on/offswitches.Using portc as outputsThe portc pins are, by default, digital input pins.However they can also be configured to be used as digital outputs.To convert the pin to output and make it highhigh portc 1To convert the pin to output and make it lowlow portc 1To convert all the pins to outputslet dirsc = %11111111To convert all the pins to inputslet dirsc = %00000000Note that ‘dirsc’ uses the common BASIC notation 0 for input and 1 for output.(Advanced - If you are more familiar with assembler code programming you mayprefer to use the command ‘let trisc =’ instead, as this uses the inverted assemblernotation - 1 for input and 0 for output. Do not attempt to directlypoke the trisc register (poke command) as the PICAXE bootstrap refreshes theregister setting regularly).To switch all the outputs on portc highlet pinsc = %11111111(or) let portc = %11111111To switch all the outputs on portc lowlet pinsc = %00000000(or) let portc = %00000000revolution(c) Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.ukVersion 6.9 07/2009All rights reserved.85
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