Extsb (Sign Extend From Byte Data To Word Data) - Fujitsu FR Family Instruction Manual

CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS

7.125 EXTSB (Sign Extend from Byte Data to Word Data)

Extends the byte data indicated by "Ri" to word data as a signed binary value.
■ EXTSB (Sign Extend from Byte Data to Word Data)
Assembler format: EXTSB Ri
exts (Ri) → Ri (byte → word)
Operation:
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: 1 cycle
Instruction format:
Example: EXTSB R1
242
N Z V C
– – – –
MSB
1 0 0 1
Instruction bit pattern : 1001 0111 1000 0001
R1
0 0 0 0 0 0 A B
Before execution
0 1 1 1 1 0
LSB
0 0 Ri
R1 F F F F F F A B
After execution