use barcode reader in asp.net which, in PIC microcontroller assembler, would look like in Software

Generator QR Code in Software which, in PIC microcontroller assembler, would look like

which, in PIC microcontroller assembler, would look like
Decode QR-Code In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Painting QR Code 2d Barcode In None
Using Barcode encoder for Software Control to generate, create QR Code ISO/IEC18004 image in Software applications.
movf andlw btfsc goto Flags, w 1 << Bit STATUS, Z Label
Read QR Code JIS X 0510 In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
QR Code ISO/IEC18004 Creator In Visual C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create QR image in .NET applications.
and is not that ef cient compared with the code that can be generated. The PIC microcontroller itself can access the bits in the processor, so the test on the bit can be done in one instruction and not by ANDing the test register with a mask value:
QR Code Maker In .NET
Using Barcode creation for ASP.NET Control to generate, create QR Code 2d barcode image in ASP.NET applications.
Make Denso QR Bar Code In .NET Framework
Using Barcode printer for VS .NET Control to generate, create Denso QR Bar Code image in VS .NET applications.
btfsc goto TestFlag Label
QR Code Creation In Visual Basic .NET
Using Barcode drawer for .NET framework Control to generate, create QR Code image in Visual Studio .NET applications.
Printing Code 128B In None
Using Barcode generator for Software Control to generate, create Code 128B image in Software applications.
which is much simpler and faster. This simple bit test and jump (or execute a single conditional instruction) also can be applied to the various hardware register bits in the PIC microcontroller. In fact, when one of the processor STATUS condition bits is tested and a jump made from its state, this is exactly what is happening. By eliminating the need to isolate a bit, as I show in the inef cient code above, the PIC microcontroller can carry out some very fast and ef cient operations.
Paint Bar Code In None
Using Barcode encoder for Software Control to generate, create bar code image in Software applications.
Generate Bar Code In None
Using Barcode maker for Software Control to generate, create barcode image in Software applications.
JUMPING AROUND
Print DataMatrix In None
Using Barcode maker for Software Control to generate, create Data Matrix ECC200 image in Software applications.
Code 3/9 Drawer In None
Using Barcode maker for Software Control to generate, create Code39 image in Software applications.
Interpage conditional jumps are somewhat dif cult to conceptualize. While I recommend avoiding them as much as possible, sometimes they have to be done. The format that I have used here, where I initialize PCLATH before the test and jump and then reset it after the test and jump, seems to be the simplest way of doing it. Because movlw and movwf do not change the processor STATUS registers, they can be used before the conditional skip instruction. For the comparison operation that is the rst conditional jump, the code could be changed to
Create Bookland EAN In None
Using Barcode maker for Software Control to generate, create ISBN - 10 image in Software applications.
Bar Code Printer In VS .NET
Using Barcode printer for Reporting Service Control to generate, create barcode image in Reporting Service applications.
movf subwf movlw movwf btfss|c goto movlw movwf ; Parameter1, w Parameter2, w HIGH PastTrue PCLATH STATUS, Z|C ; Test in Table 20.1 (NotTrue & 0x07FF) | ($ & 0x01800) HIGH $ PCLATH
Painting Bar Code In Objective-C
Using Barcode drawer for iPhone Control to generate, create bar code image in iPhone applications.
Decoding Bar Code In C#
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in .NET applications.
Code Executed if Condition is True
Decoding Bar Code In Visual Basic .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
EAN 13 Generator In Java
Using Barcode creator for BIRT Control to generate, create EAN-13 image in Eclipse BIRT applications.
NotTrue:
Bar Code Creation In None
Using Barcode maker for Microsoft Excel Control to generate, create bar code image in Microsoft Excel applications.
2D Barcode Creation In Java
Using Barcode maker for Java Control to generate, create 2D Barcode image in Java applications.
if the Code Executed if Condition is True straddles a page boundary. Another way of doing this is to jump around the goto PastTrue, as in
movf subwf btfsc|s goto movlw movwf goto ; Parameter1, w Parameter2, w STATUS, Z|C $ + 4 HIGH PastTrue PCLATH NotTrue
Test in Table Above
Code Executed if Condition is True
NotTrue:
But this code only saves one instruction and requires you to think through the negative condition to jump over. Personally, I prefer the rst method that doesn t require any negative thinking to work through. The last conditional operation is the for loop at the end of the application. In the PIC microcontroller, this can be done most ef ciently with the decfsz instruction, as is shown in CondJump, rather than with something like
clrf k ForLoop: movf j, w ; ; k = 0
is k == j
PIC MICROCONTROLLER APPLICATION BASICS
subwf btfsc goto ;
k, w STATUS, Z ForEnd
Execute Code Here k, f ForLoop ; ; Increment Counter Repeat the Test
incf goto ForEnd:
which actually performs the same function but requires quite a few more instructions. To implement a loop for a set number of loops, the number is loaded into a variable, and then the decfsz instruction is used until it is equal to 0. The only advantage I can see of using the preceding format is if the intermediate values of the counter are required. The intermediate value in the decfsz for loop can be found using the instruction snippet
movlw subwf LoopNumber k, w ; Final Value of k
In these two instructions, the current value is subtracted from the number of loops (LoopNumber) to be executed, and the result would be the same as k in the forloop analog code above for a speci c loop. Looking over this application, you probably will feel like it is pretty arti cial and doesn t represent conditional execution accurately. This feeling may be reinforced by a quick look through other examples in this chapter and other example code in this book. If you work at understanding exactly what I have been doing, I think that you will discover that the operation of the conditional code follows the examples I ve explained here and in other areas of this book. Often the examples will have considerations for other aspects of code that aren t obvious when you look at them for the rst time.
Copyright © OnBarcode.com . All rights reserved.