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PM0044 Datasheet(PDF) 141 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) 141 Page - STMicroelectronics

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PM0044
STM8 instruction set
Doc ID 13590 Rev 3
141/162
Syntax
SBC A,src
e.g. SBC A,#$15
Operation
A <= A- src - C
Description
The source byte, along with the carry flag, is subtracted from the contents
of the accumulator and the result is stored in the accumulator. The source
is a memory or data byte.
Instruction overview
V
⇒
(A7.M7 + A7.R7 + A7.M7.R7)
⊕ (A6.M6 + A6.R6 + A6.M6.R6)
Set if the signed subtraction generates an overflow, cleared otherwise.
N
⇒
R7
Set if bit 7 of the result is set (negative value), cleared otherwise.
Z
⇒
R7.R6.R5.R4.R3.R2.R1.R0
Set if the result is zero (0x00), cleared otherwise.
C
⇒
A7.M7 + A7.R7 + A7.M7.R7
Set if a borrow request occurred from bit 7 of the result, cleared otherwise.
Detailed description
See also: ADD,ADC,SUB, MUL
SBC
Subtraction with
Carry/Borrow
SBC
mnem
dst
src
Affected condition flags
VI1
H
I0
N
Z
C
SBC
A
Mem
V
-
-
-
N
Z
C
dst
src
Asm
cy
lgth
Op-code(s)
ST7
A
#byte
SBC A,#$55
1
2
A2
XX
✗
A
shortmem
SBC A,$10
1
2
B2
XX
✗
A
longmem
SBC A,$1000
1
3
C2
MS
LS
✗
A
(X)
SBC A,(X)
1
1
F2
✗
A
(shortoff,X)
SBC A,($10,X)
1
2
E2
XX
✗
A
(longoff,X)
SBC A,($1000,X)
1
3
D2
MS
LS
✗
A
(Y)
SBC A,(Y)
1
2
90
F2
✗
A
(shortoff,Y)
SBC A,($10,Y)
1
3
90
E2
XX
✗
A
(longoff,Y)
SBC A,($1000,Y)
1
4
90
D2
MS
LS
✗
A
(shortoff,SP)
SBC A,($10,SP)
1
2
12
XX
A
[shortptr.w]
SBC A,[$10.w]
4
3
92
C2
XX
✗
A
[longptr.w]
SBC A,[$1000.w]
4
4
72
C2
MS
LS
A
([shortptr.w],X)
SBC
A,([$10.w],X)
43
92
D2
XX
✗
A
([longptr.w],X)
SBC
A,([$1000.w],X)
4
4
72
D2
MS
LS
A
([shortptr.w],Y)
SBC
A,([$10.w],Y)
43
91
D2
XX
✗



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