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PM0044 数据表(PDF) 99 Page - STMicroelectronics

部件名 PM0044
功能描述  STM8 CPU programming manual
PDF  162 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM0044 数据表(HTML) 99 Page - STMicroelectronics

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PM0044
STM8 instruction set
Doc ID 13590 Rev 3
99/162
Syntax
DEC dst
Operation
dst <= dst - 1
Description
The destination byte is read, then decremented by one, and the result is
written to the destination byte. The destination is either a memory byte or a
register. This instruction is compact, and does not affect any registers when
used with RAM variables.
Instruction overview
V
⇒
(A7.M7 + M7.R7 + R7.A7)
⊕ (A6.M6 + M6.R6 + R6.A6)
Set if the signed operation 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.
Detailed description
See also: DECW, INC
DEC
Decrement
DEC
mnem
dst
Affected condition flags
VI1
H
I0
N
Z
C
DEC
Mem
V
-
-
-
N
Z
-
DEC
Reg
V
-
-
-
N
Z
-
dst
Asm
cy
lgth
Op-code(s)
ST7
ADEC A
1
1
4A
✗
shortmem
DEC $10
1
2
3A
XX
✗
longmem
DEC $1000
1
4
72
5A
MS
LS
(X)
DEC(X)
1
1
7A
✗
(shortoff.X)
DEC($10,X)
1
2
6A
XX
✗
(longoff,X)
DEC($1000,X)
1
4
72
4A
MS
LS
(Y)
DEC(Y)
1
2
90
7A
✗
(shortoff,Y)
DEC($10,Y)
1
3
90
6A
XX
✗
(longoff,Y)
DEC($1000,Y)
1
4
90
4A
MS
LS
(shortoff,SP)
DEC($10,SP)
1
2
0A
XX
[shortptr.w]
DEC[$10]
4
3
92
3A
XX
✗
[longptr.w]
DEC[$1000].w
4
4
72
3A
MS
LS
([shortptr.w],X) DEC([$10],X)
4
3
92
6A
XX
✗
([longptr.w].X]
DEC([$1000.w],X)
4
4
72
6A
MS
LS
([shortptr.w],Y) DEC([$10],Y)
4
3
91
6A
XX
✗



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