M166 Datasheet, PDF (84/127 Pages) Siemens Semiconductor Group – C16x Family of Siemens 16-Bit CMOS Single-Chip Microcontrollers

30Mar98@15:00h
C166 Family Instruction Set
Instruction Description
MOVBS
Move Byte Sign Extend
MOVBS
Syntax
Operation
Data Types
Description
MOVBS op1, op2
(low byte op1) ← (op2)
IF (op2₇) = 1 THEN
(high byte op1) ← FF_H
ELSE
(high byte op1) ← 00_H
END IF
WORD, BYTE
Moves and sign extends the contents of the source byte specified by op2
to the word location specified by the destination operand op1. The con-
tents of the moved data is examined, and the condition codes are updated
accordingly.
Condition Flags
E
Z
V
C
N
0
*
-
-
*
Addressing Modes
E Always cleared.
Z Set if the value of the source operand op2 equals zero. Cleared other-
wise.
V Not affected.
C Not affected.
N Set if the most significant bit of the source operand op2 is set. Cleared
otherwise.
Mnemonic
MOVBS
MOVBS
Rw_n, Rb_m
reg, mem
MOVBS mem, reg
Format
D0 mn
D2 RR MM MM
D5 RR MM MM
Bytes
2
4
4
Semiconductor Group
84
Version 1.2, 12.97