Table 3-11 Arithmetic Instructions (cont)
Instruction
Arithmetic
operations
Size
B
Function
(<bit 7> of <Rd>)
→
(<bits 15 to 8> of <Rd>)
Converts byte data in a general register to word data by
extending the sign bit.
0
→
(<bits 15 to 8> of <Rd>)
Converts byte data in a general register to word data by
padding with zero bits.
(EAd) – 0
Compares general register or memory contents with 0.
0 – (EAd)
→
(EAd)
Obtains the two’s complement of general register or
memory contents.
0
→
(EAd)
Clears general register or memory contents to 0.
(EAd) — 0, (1)
2
→
(<bit 7> of <EAd>)
Tests general register or memory contents, then sets the
most significant bit (bit 7) to 1.
EXTS
EXTU
B
TST
B/W
NEG
B/W
CLR
B/W
TAS
B
Note:
B—byte; W—word
3.5.4 Logic Operations
Table 3-12 lists the four instructions that perform logic operations.
Table 3-12 Logic Operation Instructions
Instruction
Logical
operations
Size
B/W
Function
Rd
∧
(EAs)
→
Rd
Performs a logical AND operation on a general register
and another general register, memory, or immediate data.
Rd
∨
(EAs)
→
Rd
Performs a logical OR operation on a general register and
another general register, memory, or immediate data.
Rd
⊕
(EAs)
→
Rd
Performs a logical exclusive OR operation on a general register
and another general register, memory, or immediate data.
(EAd)
→
(EAd)
Obtains the one’s complement of general register or memory
contents.
AND
OR
B/W
XOR
B/W
NOT
B/W
Note:
B—byte; W—word
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