mc68hc05pv8 Freescale Semiconductor, Inc, mc68hc05pv8 Datasheet - Page 53

• Manufacturer Part Number: mc68hc05pv8
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

3.6.2 Read-Modify-Write Instructions
MC68HC(8)05PV8/A — Rev. 1.9
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
1. Unlike other read-modify-write instructions, BCLR and
2. TST is an exception to the read-modify-write sequence be-
CPU and Instruction Set
Table 3-2 Read-Modify-Write Instructions
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BSET use only direct addressing.
cause it does not write a replacement value.
Instruction
Mnemonic
BCLR
BSET
TST
CPU and Instruction Set
COM
ROR
DEC
NEG
ASR
CLR
ROL
ASL
LSR
INC
LSL
(2)
(1)
(1)
Instruction Types
Technical Data