PICAXE Manual Section 1 - TechnoPujades - Free

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www.picaxe.co.ukSection 1 52GETTING STARTEDThe scratchpad pointer variable is broken down into individual bit variables:ptrl = ptr7 : ptr6 : ptr5 : ptr4 : ptr3 : ptr2 : ptr1 : ptr0ptrh = xxxx : xxxx : xxxx : xxxx : xxxx : xxxx : ptr9 : ptr8See the ‘Variables - Scratchpad’ section (manual part 2) for more informationabout@ptr, @ptrinc, @ptrdecThe system ‘flags’ byte is broken down into individual bit variables. If the specialhardware feature of the flag is not used in a program the individual flag may befreely used as a user defined bit flag.Name Special Special functionflag0 hint0flag hardware interrupt on pin INT0flag1 hint1flag hardware interrupt on pin INT1flag2 hint2flag hardware interrupt on pin INT2flag3 hintflag hardware interrupt on any pin 0,1,2flag4 compflag hardware interrpt on comparatorflag5 hserflag hserial background receive has occurredflag6 hi2cflag hi2c write has occurred (slave mode)flag7 toflag timer overflow flagrevolution(c) Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.ukVersion 6.9 07/2009All rights reserved.52
www.picaxe.co.ukSection 1 53GETTING STARTEDFlowchart, Logic or BASIC?The Programming Editor software supports both textual BASIC programmingand graphical flowchart and graphical logic gate programming.The Logicator for PIC micros software provides a graphical flowchart method ofprogramming. It is widely used within schools.All programming methods use the same BASIC commands and syntax. Theflowchart method simply provides a graphical way of joining the BASICcommands together, to save typing in programs. Flowcharting uses a smaller subsetof the BASIC commands, and is generally used by younger students in theeducational environment.The logic method is designed for use in schools to teach students the function ofbasic logic gates (AND, OR etc). It is a simple introduction and not designed forcomplex projects.One advantage of flowchart programming is the graphical on-screen simulation.This allows students to ‘see’ their program in operation before downloading tothe PICAXE. However only certain commands are supported by the flowcharteditor.Most hobbyist and experienced educational users prefer the textual BASICmethod of programming. It is much more powerful than flowcharts, which canbecome very complicated for large programs.All flowcharts are automatically converted into BASIC programs prior todownload to the PICAXE microcontroller. Therefore the main focus of thismanual is on textual BASIC programming.For further information on the flowchart programming method In ProgrammingEditor, please see the flowchart appendix at the end of this manual. Logicator hasit’s own, separate, instruction manual.main:high 0wait 1low 0wait 1goto mainstarthigh 0wait 1low 0wait 1revolution(c) Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.ukVersion 6.9 07/2009All rights reserved.53
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PICAXE Manual Section 1 - TechnoPujades - Free

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