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ECE 447: Lecture 16. The 68HC11 Instruction Set. ECE 447: Instruction Types. 1. Data handling instructions a. Move instructions ( e.g. , load, store, exchange) b. Alter data instructions ( e.g. , clear, increment, decrement) c. Edit instructions
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ECE 447: Lecture 16 The 68HC11 Instruction Set
ECE 447: Instruction Types 1. Data handling instructions a. Move instructions (e.g., load, store, exchange) b. Alter data instructions (e.g., clear, increment, decrement) c. Edit instructions (e.g., shift, rotate) 2. Arithmetic instructions (e.g., add, subtract, multiply, divide, negate) 3. Logic instructions (e.g., and, or, xor) 4. Data test instructions (e.g. compare, test, bit test)
ECE 447: Instruction Types (con’t) 5. Control instructions (e.g., jump, branch) 6. Condition code instructions (e.g., set carry, clear overflow flag) 7. Stack operations (e.g. push, pull) 8. Subroutine-related instructions (e.g. jump to subroutine, return from subroutine) 9. Interrupt-related instructions (e.g. software interrupt, return from interrupt)
ECE 447: Move Instructions 1. memory register LDA [A, B] LD [D, X, Y, S] 2. register memory STA [A, B] ST [D, X, Y, S] 3. register register TAB, TBA 4. memory memory IMM, DIR, EXT, IND 0 – 0 – DIR, EXT, IND 0 – INH
ECE 447: Move Instructions N Z V C 5. register register XGD [X, Y] – – – – INH
ECE447: Alter Data Instructions N Z V C 1. 0 register CLR [A, B] 2. 0 memory CLR 0 1 0 0 INH EXT, IND 0 1 0 0 3. increment X++ INC [A, B] INC IN [X, Y] 4. decrement X-- DEC [A, B] DEC DE [X, Y] INH EXT, IND INH – – – – INH EXT, IND INH – – – –
ECE447: Edit Instructions - Shifts N Z V C . . . 1. logical shift right LSR [A, B, D] LSR 2. arithmetic shift right ASR [A, B, D] ASR 3. arithmetic/logical shift left ASL [A, B, D], LSL [A, B, D] ASL, LSL 0 C 0 n-1 INH EXT, IND 0 . . . C 0 n-1 INH EXT, IND . . . C 0 0 n-1 INH EXT, IND
ECE447: Edit Instructions-Rotations N Z V C . . . 1. rotation right ROR [A, B] ROR 2. rotation left ROL [A, B] ROL 0 7 C INH EXT, IND . . . 0 7 0 C INH EXT, IND
ECE 447: Arithmetic Instructions N Z V C 1. addition Reg + B Reg ABA AB [X, Y] 2. subtraction A – B A SBA INH – – – – INH 3. negation -X NEG [A, B] NEG INH EXT, IND
ECE 447: Arithmetic Instructions N Z V C 1. addition Reg + B Reg ABA AB [X, Y] 2. subtraction A – B A SBA INH – – – – INH
ECE 447: Arithmetic Instructions N Z V C 1. unsigned multiplication A x B D MUL 2. unsigned division D/IX IX D mod IX D IDIV 3. unsigned fractional division D < IX (scaled by 216) D/ IX IX (scaled by 216) D mod IX D 4. decimal adjustment DAA – – – INH – 0 INH – FDIV INH ? INH
ECE 447: Logical Instructions N Z V C 1. AND Acc & M Acc AND [A, B] 2. OR Acc | M Acc ORA [A, B] 3. XOR Acc M Acc EOR [A, B] 0 – IMM, DIR, EXT, IND 0 – IMM, DIR, EXT, IND 0 – IMM, DIR, EXT, IND
ECE 447: Logical Instructions N Z V C 1. complement X X COM [A, B] COM 2. bit set M | mask M BSET 3. bit clear M & mask M BCLR INH EXT, IND 0 1 0 – DIR, IND 0 – DIR, IND
ECE 447: Data Test Instructions N Z V C 1. comparison R - M CMP [A, B] CP [D, X, Y] IMM, DIR, EXT, IND 2. comparison A – B CBA INH 3. test register TST [A, B] 0 0 INH
ECE 447: Data Test Instructions N Z V C 4. test memory TST 5. Bit test Acc & memory BIT [A, B] 0 0 EXT, IND IMM, DIR, EXT, IND 0 –
ECE 447: Branch Instructions N Z V C – – – – REL after comparison register vs. memory unsigned numbers signed numbers BHI higher > BLO lower < BHS higher or same BLS lower or same BGT greater than > BLT less than < BGE greater than or equal BLE less than or equal BEQ equal = BNE not equal
ECE 447: Brach Instructions after arithmetic operations (testing for overflow) unsigned numbers signed numbers BCS carry set BCC carry clear BVS overflow set BVC overflow clear after testing register or memory BPL plus 0 BMI minus < 0 unconditional BRA always BRN never
ECE 447: Condition Code Instructions 1. set a flag 1 flag SE [C, V, I] 2. clear a flag 0 flag CL [C, V, I] 3. change all flags A CC TAP 4. read all flags CC A TPA