birt code 39

birt code 39

birt code 39

birt code 39

birt code 39

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

The advantage of this method is that it requires a minimal amount of amount of code and executes in the least number of cycles. The problem with this method is that it does not allow implementation of nested subroutines, and if you do want to have nested subroutines, you would have to copy one subroutine s parameters into separate variables before using the global variables for the nested subroutine call. This method cannot be used for recursive subroutines, nor can it be used for interrupt handlers that may call subroutines (or use the common global variables) that are already active. Despite these drawbacks, this method of parameter passing is an excellent way for new-application developers to pass subroutine and function parameters in assembly language because it is so simple. The second method is to use unique parameter variables for each subroutine. Before the call, the unique variables are loaded with the input parameters, and after the call, the returned parameter is taken from one of the variables. In this case, the statement

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A = subroutine(parm1, parm2);

movf movwf movf movwf call movf movwf parm1, w subroutineparm1 parm2, w subroutineparm2 subroutine subroutinereturn, w A ; Save Parameters ; passed to Subroutine

This method allows nested subroutines to be implemented and even optimizes the amount of variable space if the nested subroutine paths are plotted and the variables are chosen in such a way that the variables passed in the different paths are not reused. As with the global variable method, this method does not allow for calls from the interrupt handler, nor does it allow for recursive code. Despite these drawbacks, this method is

often the preferred method of implementation because it is fast and very memoryef cient. The method normally used by most processors and high level languages is to save parameters on a stack and then access the parameters from the stack. As indicated earlier, the low-end and mid-range PIC microcontroller cannot access stack data directly, but the FSR (INDEX) register offsets can be calculated easily. Before any subroutine calls can take place, the FSR has to be offset with the start of a buffer:

The increment of FSR is done rst so that if an interrupt request is acknowledged during this operation, any pushes in the interrupt handler will not affect the data in the mainline. Popping data from the stack uses the format

From the overall material balance it is evident that the flow of only one of the product streams can be set independently. The flow of the other is determined by the feed rate and is therefore a dependent variable. But one flow must be set by some criterion, since they cannot both be allowed to drift. For t,he moment, distillate flow will be chosen to be manipulated by the control system, either directly or indirectily. (The reason for this choice will be discussed later.) Bottoms flow must then be manipulated by a controller which senses liquid level at the bottom of the tower in order to close the material balance by maintaining constant liquid inventory. Bottoms flow is thus dependent on current values of feed and distillate: B = F - D Substituting for B in the material balance of the light component permits expressing the relationship between the quality of both products in,terms of distillate flow: Fz = Dy + (F - D)x The ratio D/F determines the relative composition of each product: z-x _ _ y-x D =F (11.3)

movf incf movwf movf incf movwf incf call movf decf movwf decf decf parm1 , w FSR, f INDF parm 2, w FSR, f INDF FSR, f subroutine INDF, w FSR, f A FSR, f FSR, f ; Save Parameters

This method is very good because it does not require global variables of any type and allows for subroutines that are called from both the execution main line and the interrupt handler or recursively. In addition, data on the stack can be changed (this operation has created local variables). The disadvantage of this method is the complexity required for accessing data within the subroutine and adding additional variables with low-end and mid-range PIC microcontrollers. When accessing the variables and changing FSR, you will have to disable interrupts. For the preceding example, to read parm1, the following code would have to used: