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The call instruction (as well as the corresponding return) instruction has the capability, when a 1 is speci ed as the s bit at the end of the instruction, of saving the context registers WREG, BRS, and STATUS in shadow registers of the fast stack, which are retrieved by the return instruction by specifying a 1 as well. The issue that you should be aware of for the context save is that you can only save one set of values on the fast stack and the context values of the mainline are always saved when an interrupt is acknowledged. This limits the usability of the context register save to applications that only have a single deep call and no interrupts. For your rst PIC18 applications, I would recommend that you use the instruction set s single word instructions only. The only time you should be using the goto or call instructions is if you have to access a memory location outside the range of the relative branches. This range is 512 to +511 instruction addresses for the bra (branch always) and rcall (relative call) instructions and 64 to +63 instruction addresses for the conditional branch instructions that I will discuss below. The rcall instruction information is shown in Fig. 7.53. Along with using the single word execution change instructions, I also recommend that you be careful when using the $ directive and branching relative to it. When the assembler is calculating addresses, it works on a byte basis, not a word basis as it does for other PIC microcontrollers. This means that you must multiply the number of instructions by 2 to get the correct address. Consider the simple delay loop:

Instruction Operation: Push Next Address; PC = PC + 2 + 2's Complement n ;

Notes: Rcall 2 s Complement Offset is Added to the Address of the Next Instruction. Note, the 2 s Complement Offset MUST be even

Flags Affected: None Instruction Cycles: 2

Figure 7.53 The rcall instruction allows accessing subroutines that start 64 to +63 instructions from the current program counter location.

If you were to enter the code into the PIC18InsTemplt.asm project and build it, you would get a warning indicating that the instruction cannot start at an odd address. To x the problem, you have to multiply the offset by 2, producing the code:

which will build cleanly and you can simulate to see that it actually takes 141 (47 times 3) instructions. If you want to avoid this difference between the PIC18 and the other devices, I would recommend that you always use labels and never use relative addressing. Above, I indicated that there was a one word goto instruction called bra (branch always). This instruction type (shown in Fig. 7.54) changes the program counter according to the 2 s complement offset provided in the instruction according to the formula:

where PCcurrent is the current address of the executing branch instruction. The 2 added to PCcurrent results in the address after the current one. Offset is the 2 s complement value, which is added or subtracted (if the Offset is negative) from the sum of PCcurrent and 2. The MPASM assembler computes the correct offset for you when the destination of a branch instruction is a label. MPASM computes the 2 s complement offset using the formula:

Dana Eldridge is a master storyteller. He spent twenty years as a teacher and now works as an interpretive ranger at the Cape Cod National Seashore. He writes a biweekly column for the Cape Codder newspaper and is the author of three books: Once upon Cape Cod: From Cockle Cove to the Powder Hole; Cape Cod Lucky, in Another Time; and his latest, Cape Cod Kinship: Two Centuries, Two Wars, Two Men. Dana can be reached at danaeldridgebooks.com.

Offset = Destination (Current Address)