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PM0044 Datasheet(PDF) 152 Page - STMicroelectronics

No. de pieza PM0044
Descripción Electrónicos  STM8 CPU programming manual
PDF  162 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0044 Datasheet(HTML) 152 Page - STMicroelectronics

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STM8 instruction set
PM0044
152/162
Doc ID 13590 Rev 3
Syntax
SUBW dst,src
e.g. SUBW X, #$5500
Operation
dst <= dst - src
Description
The source 16-bit word is subtracted from the contents of the destination
index register and the result is stored in the same index register. The
source is a memory or 16-bit data.
Instruction overview
V
⇒
(X15.M15 + X15.R15 + X15.M15.R15)
⊕ (X14.M14 + X14.R14 +
X14.M14.R14)
Set if the signed operation generates an overflow, cleared otherwise.
H
⇒
X7.M7 + X7.R7 + X7.M7.R7
Set if a carry occurred from bit 7, cleared otherwise.
N
⇒
R15
Set if bit 7 of the result is set (negative value), cleared otherwise.
Z
⇒
R15.R14.R13.R12.R11.R10.R9.R8.R7.R6.R5.R4.R3.R2.R1.R0
Set if the result is zero (0x00), cleared otherwise.
C
⇒
X15.M15 + X15.R15 + X15.M15.R15
Set if a borrow request occurred from bit 15, cleared otherwise.
Detailed description
See also: SUB, ADDW, ADC, SBC, MUL
SUBW
Word Subtraction
SUBW
mnem
dst
src
Affected condition flags
VI1
H
I0
N
Z
C
SUBW
X
Mem
V
-
H
-
N
Z
C
SUBW
Y
Mem
V
-
H
-
N
Z
C
dst
src
Asm
cy
lgth
Op-code(s)
ST7
X
#word
SUBW X,#$5500
2
3
1D
MS
LS
X
longmem
SUBW X,$1000
2
4
72
B0
MS
LS
X
(shortoff, SP)
SUBW X,($10,SP)
2
3
72
F0
XX
Y
#word
SUBW Y,#$5500
2
4
72
A2
MS
LS
Y
longmem
SUBW Y,$1000
2
4
72
B2
MS
LS
Y
(shortoff, SP)
SUBW Y,($10,SP)
2
3
72
F2
XX



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