MC68HC05P9ACDW FREESCALE [Freescale Semiconductor, Inc], MC68HC05P9ACDW Datasheet - Page 38

• Manufacturer Part Number: MC68HC05P9ACDW
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

CPU
Read-Modify-
Write Instructions
38
NOTE:
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.
Do not use read-modify-write operations on write-only registers.
Freescale Semiconductor, Inc.
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Arithmetic Shift Left (Same as LSL)
Arithmetic Shift Right
Bit Clear
Bit Set
Clear Register
Complement (One’s Complement)
Decrement
Increment
Logical Shift Left (Same as ASL)
Logical Shift Right
Negate (Two’s Complement)
Rotate Left through Carry Bit
Rotate Right through Carry Bit
Test for Negative or Zero
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1. Unlike other read-modify-write instructions, BCLR and
2. TST is an exception to the read-modify-write sequence be-
Table 5. Read-Modify-Write Instructions
BSET use only direct addressing.
cause it does not write a replacement value.
CPU
Instruction
Mnemonic
BCLR
BSET
TST
COM
ROR
ASR
DEC
NEG
ROL
CLR
LSR
ASL
LSL
INC
(2)
(1)
(1)
MOTOROLA
16-hc05cpu