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UPSD3233 数据表(PDF) 21 Page - STMicroelectronics |
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UPSD3233 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 170 page  21/170 uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV First, pointers R1 and R0 are set up to point to the two bytes containing the last four BCD digits. Then a loop is executed which leaves the last byte, loca- tion 2EH, holding the last two digits of the shifted number. The pointers are decremented, and the loop is repeated for location 2DH. The CJNE in- struction (Compare and Jump if Not equal) is a loop control that will be described later. The loop executed from LOOP to CJNE for R1 = 2EH, 2DH, 2CH, and 2BH. At that point the digit that was orig- inally shifted out on the right has propagated to lo- cation 2AH. Since that location should be left with 0s, the lost digit is moved to the Accumulator. Table 7. Shifting a BCD Number Two Digits to the Right (using direct MOVs: 14 bytes) Table 8. Shifting a BCD Number Two Digits to the Right (using direct XCHs: 9 bytes) Table 9. Shifting a BCD Number One Digit to the Right 2A 2B 2C 2D 2E ACC MOV A,2Eh 00 12 34 56 78 78 MOV 2Eh,2Dh 00 12 34 56 56 78 MOV 2Dh,2Ch 00 12 34 34 56 78 MOV 2Ch,2Bh 00 12 12 34 56 78 MOV 2Bh,#0 00001234 56 78 2A 2B 2C 2D 2E ACC CLR A 00 12 34 56 78 00 XCH A,2Bh 00 00 34 56 78 12 XCH A,2Ch 00 00 12 56 78 34 XCH A,2Dh 00 00 12 34 78 56 XCH A,2Eh 00 00 12 34 56 78 2A 2B 2C 2D 2E ACC MOV R1,#2Eh 00 12 34 56 78 xx MOV R0,#2Dh 00 12 34 56 78 xx ; loop for R1 = 2Eh LOOP: MOV A,@R1 0012 3456 78 78 XCHD A,@R0 0012 3458 78 76 SWAP A 00 12 34 58 78 67 MOV @R1,A 00 12 34 58 67 67 DEC R1 0012 3458 67 67 DEC R0 0012 3458 67 67 CNJE R1,#2Ah,LOOP 00 12 34 58 67 67 ; loop for R1 = 2Dh 00 12 38 45 67 45 ; loop for R1 = 2Ch 00 18 23 45 67 23 ; loop for R1 = 2Bh 08 01 23 45 67 01 CLR A 08 01 23 45 67 00 XCH A,2Ah 00 01 23 45 67 08 |
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