MC68HC705J1A

Manufacturer Part NumberMC68HC705J1A
ManufacturerMotorola
MC68HC705J1A datasheet
 


Specifications of MC68HC705J1A

CaseDIP-20L  
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Read-Modify-Write Instructions

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Central Processor Unit (CPU)
3.6.2.2 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 instructions on registers with write-only
bits.
Technical Data
56
Table 3-2. Read-Modify-Write Instructions
Instruction
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
BSET use only direct addressing.
2. TST is an exception to the read-modify-write sequence
because it does not write a replacement value.
Central Processor Unit (CPU)
Mnemonic
ASL
ASR
(1)
BCLR
(1)
BSET
CLR
COM
DEC
INC
LSL
LSR
NEG
ROL
ROR
(2)
TST
MC68HC705J1A — Rev. 4.0
MOTOROLA