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To access data, the address with the offset to the byte address can be used as shown in the following example:
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movf j + 1, w
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When working with constant values, instead of coming up with arithmetic operations to capture the byte data at speci c locations, you can use the LOW, HIGH, and UPPER operators (how they work is presented in Table 8.4).
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16-BIT OPERATIONS
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TABLE 8.4 OPERATOR
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OPERATION OF LOW, HIGH, AND UPPER MPASM OPERATORS DESCRIPTION MATHEMATICAL OPERATION
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LOW HIGH UPPER
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Return low byte (bits 7 0) of value Return bits 15 8 of value Return bits 21 16 of value
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One confusing aspect of MPLAB for me is the default of high/low data storage in the MPLAB simulator and MPASM. The low/high format works better for using application code and makes more sense to me (this is known as Intel format, and the reason why it makes sense to me is because of all the years I ve spent working with Intel processors). In addition, you will note that all 16-bit registers in the PIC microcontroller are de ned in low (byte/address) followed by high (byte/address) data format, so using this format in my coding keeps me consistent with the hardware registers built into the chip processor architecture. The preceding paragraph may be confusing for you, but let me explain exactly what I mean. If 16-bit data is saved in the high/low (what I think of as Motorola format, which is where I rst saw it), when 16-bit information is displayed in memory, it looks correct. For example, if 0x1234 was stored in high/low format staring at address 0x10, the le register display would show
0010 1234
which appears natural. If the data is stored in low/high (Intel) format, 0x1234 at 0x10 would appear as
0010 3412
which is somewhat confusing. I recommend storing data in low/high format for two reasons; the rst is that it makes logical sense saving the low value byte at the low address. The second reason is that in your career, you probably will work with more Intel-architected devices than Motorola devices, and you might as well get into the habit of mentally reversing the bytes now. The act of mentally reversing the two bytes becomes second nature very quickly, and I dare say that you will become very familiar and comfortable with it after working through just a few applications. When multibyte data is displayed in MPLAB watch windows, the default is in the high/low format. Make sure that when you add a multibyte variable to the window, you click on the low/high selection. Working with multibyte variables is not as simple as working with single-byte variables because the entire variable must be taken into account.
ASSEMBLY-LANGUAGE SOFTWARE TECHNIQUES
For example, when incrementing a byte, the only considerations are the value of the result and the zero ag. This can be implemented quite easily for a 16-bit variable:
incf LOW variable, f btfsc STATUS, Z incf HIGH variable, f
Addition with two 16-bit variables becomes much more complex because along with the result, the zero, carry, and digit carry ags must be involved as well. This code correctly computes the 16-bit result and correctly sets the zero and digit carry ags. Unfortunately, it requires ve more instructions than a simple case and does not set carry correctly. To set carry correctly, a temporary variable and 20 instructions are required:
clrf movf addwf movwf btfsc bsf movf addwf movwf btfsc goto incf btfsc bsf movf addwf xorwf bcf btfsc bcf Temporary HIGH A, w HIGH B, w HIGH C, w STATUS, C Temporary, 0 LOW A, w LOW B, w LOW C STATUS, C $ + 6 HIGH C, f STATUS, Z Temporary, 0 LOW A, w LOW B, w LOW C, w STATUS, C Temporary, 0 STATUS, C
This level of delity is not often required. Instead, you should pick the multibyte operation that provides you with the result that you need. In the appendices I present routines that provide the correct 16-bit result, but the STATUS ags will not be correct for the result. For correct ags, more code will be required.
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