Fundmentals of microcontrollers, Lecture notes of Engineering

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EMCH 367 Fundamentals of Microcontrollers Example 9 EXAMPLE 9 OBJECTIVE This exercise has the following objectives: | Introduce hex subtraction 0 Introduce hex subtraction with negative results using the free borrow concept. 0 Show the decimal equivalent of hex subtraction with negative results using free borrow. Note: To facilitate understanding, the same numbers are used in both decimal and the hex cases. PROGRAM The program ex9.asm performs the following arithmetic operations: |. $0d - $06 = $07 (hex) using the opcode mnemonics LDAA, LDAB, SBA Il. $00 - $05 = $fb (hex) using the opcode mnemonics LDAA, LDAB, SBA I. 0 - 5 = 251 (decimal equivalent of &-bit hex arithmetic) using the opcode mnemonics LDAA, LDAB, SBA IV. $0e - $3a = $d4 (hex) using the opcode mnemonics LDAA, LDAB, SBA V. 14 - 58 = 212 (decimal equivalent of 8-bit hex arithmetic) using the opcode mnemonics LDAA, LDAB, SBA Dr. Victor Giurgiutiu Pagel 14/2019