Zilog Z16F2810 - Manual (Page 119)

UM018809-0611 EXT Instruction
ZNEO
®
CPU Core
User Manual
103
EXT
Definition
Extend
Syntax
EXT dst, src
Operation
dst

src
Description
This instruction loads an 8-bit or 16-bit value from the source register into the destination register
with Signed or Unsigned extension. Byte (8-bit) or Word (16-bit) data size is selected by adding
a .B or .W, suffix, respectively, to the EXT mnemonic. A “U” in the mnemonic suffix selects zero
(unsigned) extension. An “S” in the mnemonic suffix selects signed extension. See LD for
instructions to read memory values with extension.
Flags
Syntax and Opcodes
7 6 5 4 3 2 1 0
C Z S V B CIRQE IRQE
– * * – * – – –
Legend
C = No change.
Z = Set to 1 if the result is zero; otherwise, set to 0.
S = Set to 1 if the result msb is 1; otherwise set to 0.
V = No change.
B = Cleared to 0.
CIRQE = No change.
IRQE = No change.
Instruction, Operands Word 0 Word 1 Word 2
EXT.SW Rd, Rs {43H, Rs, Rd}
EXT.UW Rd, Rs {41H, Rs, Rd}
EXT.SB Rd, Rs {42H, Rs, Rd}
EXT.UB Rd, Rs {40H, Rs, Rd}