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PM0044 数据表(PDF) 94 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) 94 Page - STMicroelectronics

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STM8 instruction set
PM0044
94/162
Doc ID 13590 Rev 3
Syntax
CP dst,src
e.g. CP A,(tbl,X)
Operation
{N, Z, C} = Test (dst - src)
Description
The source byte is subtracted from the destination byte and the result
is lost. However, N, Z, C flags of Condition Code (CC) register are updated
according to the result.The destination is a register, and the source is a
memory or data byte. This instruction generally is used just before a
conditional jump instruction.
Instruction overview
V
⇒
(A7.M7 + A7.R7 + A7.M7.R7)
⊕ (A6.M6 + A6.R6 + A6.M6.R6)
Set if the signed subtraction of the destination (dst) value from the
source (src) value generates a signed overflow (signed result cannot be
represented on 8 bits).
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 the unsigned value of the contents of source (src) is larger than the
unsigned value of the destination (dst), cleared otherwise.
Detailed description
See also: CPW, TNZ, BCP
CP
Compare
CP
mnem
dst
src
Affected condition flags
VI1
H
I0
N
Z
C
CP
Reg
Mem
V
-
-
-
N
Z
C
dst
src
Asm
cy
lgth
Op-code(s)
ST7
A
#byte
CP A,#$10
1
2
A1
XX
✗
A
shortmem
CP A,$10
1
2
B1
XX
✗
A
longmem
CP A,$1000
1
3
C1
MS LS
✗
A(X)
CP A,(X)
1
1
F1
✗
A
(shortoff,X)
CP A,($10,X)
1
2
E1
XX
✗
A
(longoff,X)
CP A,($1000,X)
1
3
D1
MS LS
✗
A(Y)
CP A,(Y)
1
2
90
F1
✗
A
(shortoff,Y)
CP A,($10,Y)
1
3
90
E1
XX
✗
A
(longoff,Y)
CP A,($1000,Y)
1
4
90
D1
MS LS
✗
A
(shortoff,SP)
CP A,($10,SP)
1
2
11
XX
A
[shortptr.w]
CP A,[$10.w]
4
3
92
C1
XX
✗
A
[longptr.w]
CP A,[$1000.w]
4
4
72
C1
MS LS
A
([shortptr.w],X)
CP A,([$10.w],X)
4
3
92
D1
XX
✗
A
([longptr.w],X)
CP A,([$1000.w],X)
4
4
72
D1
MS LS
A
([shortptr.w],Y)
CP A,([$10.w],Y)
4
3
91
D1
XX
✗



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