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how operations can be written to avoid taking up extra cycles and instructions for operations that just require one instruction. The three conditional cases in CondJump.asm may seem to be quite limited in their scope, but used with the STATUS register experiments presented earlier in this chapter and used with ags, they are really all you have to be aware of for most of your applications. When I created the CondTest application, it was created as an assembly-language version of the C application:
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Main() { int bit i, j, k; TestFlag; // Initialize the Variables
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i = 5; j = 7; TestFlag = 0; if (I < j) TestFlag = 1; if (TestFlag == 1) goto LongJump; while (1 == 1); : LongJump: for (k = 0; k < j; k++ ) i = i + 1; while (1 == 1); }
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Label in another Page // Repeatedly increment I
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The CondJump code demonstrates an 8-bit comparison, a bit test, and a counting loop that you will use in your own applications. The source code can be found in the code\CondJump folder. Note that the code is written for a PIC16C73B, which has more than one page of instructions. This was done to show you how to implement interpage conditional jumps.
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title CondJump - Conditional Jumping ; ; This application shows how conditional jumping can be ; implemented in a variety of different situations,
PIC MICROCONTROLLER APPLICATION BASICS
; including interpage jumps. ; ; Myke Predko ; 99.12.29 ; ; Hardware Notes: ; Simulated 16C73B ; No I/O ; LIST R=DEC INCLUDE p16c73b.inc ; Registers CBLOCK 0x020 Flags i, j ENDC #de ne TestFlag Flags, 0
< Note PIC16C74B
De ne a File Register Flag
__CONFIG _CP_OFF & _WDT_OFF & _RC_OSC PAGE Mainline of CondJump org 0 clrf movlw movwf movlw movwf ; ; Flags 5 i 7 j ; ; No Flag is Set Setup Test Variables
if (i < j) TestFlag = 1; movf subwf btfsc goto bsf j, w i, w STATUS, C $ + 2 TestFlag ; ; Subtract j from i And Look at Carry Result
if (TestFlag == 1) goto LongJump movlw movwf HIGH LongJump PCLATH ; Set up PCLATH for the Long Jump
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btfsc goto movlw movwf goto
TestFlag LongJump & 0x07FF HIGH $ PCLATH $
; ; ;
Restore PCLATH to the Current Page Endless Loop if TestFlag == 0
org 0x0800 LongJump: ; ; for (j = 0; j < 7; j++ ) i = i + 1; incf i, f decfsz j, f goto $ - 2 goto $ ; Increment i , j Times
To explain the code, I want to work through each test individually, looking back to the original C source and comparing it with the source code just presented. The variable initialization should not be of any surprise to you. In this code, I load i with 5 and j with 7 and clear the FLAGS register, clearing TestFlag at the same time. The rst comparison is executing the next instruction if i is less than j. This comparison was discussed in previous experiments as well as the text and has the basic form
movf Parameter1, w subwf Parameter2, w btfss|c STATUS, Z|C ; Test in Table Below goto NotTrue ; Code Executed if Condition is True NotTrue:
With Parameter1, Parameter2, and whether or not the carry or zero ag is speci ed, the following conditional execution code can be implemented according to Table 20.1. In CondJump, I followed this format instruction explicitly, but I could have simpli ed it to
movf subwf btfss bsf j, w i, w STATUS, C TestFlag ; ; Subtract j from i And Look at Carry Result
PIC MICROCONTROLLER APPLICATION BASICS
TABLE 20.1 THE DIFFERENT PARAMETERS FOR THE FOURINSTRUCTION CONDITIONAL EXECUTION TEST CONDITION Parameter1 Parameter2 TEST INSTRUCTION
A == B A != B A > B A >= B A < B A <= B
A A A B B A
B B B A A B
btfss STATUS, Z btfsc STATUS, Z btfsc STATUS, C btfss STATUS, C btfsc STATUS, C btfss STATUS, C
because there is only one instruction that is executed conditionally, and the jump over the code that executes if the condition is true consists of one instruction that can be handled by the skip on bit state instructions. The next conditional jump is interesting for two reasons. The rst is that it is jumping to another page, and the second is that the jump is based on the condition of the ag. In a traditional processor, a jump on ag condition probably would involve the operations
if (((Flag & (1 << Bit)) != 0) goto Label;
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