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S3C72G9 Datasheet(PDF) 69 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 69 Page - Samsung semiconductor |
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69 / 96 page  % %'" ' LDC (Continued) Examples: 2. The following instructions will load one of four values defined by the define byte (DB) directive to the extended accumulator: ORG 0500H DB 66H DB 77H DB 88H DB 99H DISPLAY LD WX,#00H LDC EA,@WX ; EA ← address 0500H = 66H RET If the instruction 'LD WX,#01H' is executed in place of 'LD WX,#00H', then EA ← address 0501H = 77H. If the instruction 'LD WX,#02H' is executed in place of 'LD WX,#00H', then EA ← address 0502H = 88H. 3. Normally, the LDC EA, @EA and the LDC EA, @WX instructions reference the table data on the page on which the instruction is located. If, however, the instruction is located at address xxFFH, it will reference table data on the next page. In this example, the upper 4 bits of the address at location 0200H is loaded into register E and the lower 4 bits into register A: ORG 01FDH 01FDH LD WX,#00H 01FFH LDC EA,@WX ; E ← upper 4 bits of 0200H address ; A ← lower 4 bits of 0200H address 4. Here is another example of page referencing with the LDC instruction: ORG 0100H DB 67H SMB 0 LD HL,#30H ; Even number LD WX,#00H LDC EA,@WX ; E ← upper 4 bits of 0100H address ; A ← lower 4 bits of 0100H address LD @HL,EA ; RAM (30H) ← 7, RAM (31H) ← 6 |
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