mc68hc705c9a Freescale Semiconductor, Inc, mc68hc705c9a Datasheet - Page 82

• Manufacturer Part Number: mc68hc705c9a
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Instruction Set
11.3.2 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.
82
Do not use read-modify-write operations on write-only registers.
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
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
Table 11-2. Read-Modify-Write Instructions
BSET use only direct addressing.
because it does not write a replacement value.
Instruction
NOTE
Mnemonic
BCLR
BSET
TST
COM
DEC
NEG
ROR
ASR
CLR
ROL
ASL
LSR
INC
LSL
(2)
(1)
(1)
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