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68HC705SP7 датащи(PDF) 193 Page - Freescale Semiconductor, Inc |
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68HC705SP7 датащи(HTML) 193 Page - Freescale Semiconductor, Inc |
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193 / 230 page ![]() Instruction Set Instruction Types MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0 General Release Specification Instruction Set 14.4.2 Read-Modify-Write Instructions These instructions read a memory location or a register, modify its contents, and write the modified value back to the memory location or to the register. NOTE: Do not use read-modify-write operations on write-only registers. 1. Unlike other read-modify-write instructions, BCLR and BSET use only direct addressing. 2. TST is an exception to the read-modify-write sequence be- cause it does not write a replacement value. Table 14-2. Read-Modify-Write Instructions Instruction Mnemonic Arithmetic Shift Left (Same as LSL) ASL Arithmetic Shift Right ASR Bit Clear BCLR(1) Bit Set BSET(1) Clear Register CLR Complement (One’s Complement) COM Decrement DEC Increment INC Logical Shift Left (Same as ASL) LSL Logical Shift Right LSR Negate (Two’s Complement) NEG Rotate Left through Carry Bit ROL Rotate Right through Carry Bit ROR Test for Negative or Zero TST(2) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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