User’s Manual
C166S V1 SubSystem
Detailed Instruction Set
User’s Manual
6-93
V 1.6, 2001-08
SUBB
Integer Subtraction
SUBB
Group
Arithmetic Instructions
Syntax
SUBB op1, op2
Source Operand(s)
op1, op2
→
BYTE
Destination Operand(s)
op1
→
BYTE
Operation
(op1)
←
(op1) - (op2)
Description
Performs a 2’s complement binary subtraction of the source operand specified by op2
and the destination operand specified by op1. The result is then stored in op1.
CPU Flags
E
Set if the value of op2 represents the lowest possible negative number.
Cleared otherwise. Used to signal the end of a table.
Z
Set if result equals zero. Cleared otherwise.
V
Set if an arithmetic underflow occurred, i.e. the result cannot be
represented in the word data type. Cleared otherwise.
C
Set if a borrow is generated. Cleared otherwise.
N
Set if the most significant bit of the result is set. Cleared otherwise.
Encoding
E
Z
V
C
N
*
*
*
S
*
Mnemonic
Format
Bytes
SUBB
Rb
n
, #data3
29 n:0###
2
SUBB
Rb
n
, Rb
m
21 nm
2
SUBB
Rb
n
, [Rw
i
+]
29 n:11ii
2
SUBB
Rb
n
, [Rw
i
]
29 n:10ii
2
SUBB
mem , reg
25 RR MM MM
4
SUBB
reg , #data8
27 RR ## xx
4
SUBB
reg , mem
23 RR MM MM
4
Содержание C166S V1 SubSystem
Страница 10: ...User s Manual C166S V1 SubSystem User s Manual I 6 V 1 6 2001 08...
Страница 16: ...User s Manual C166S V1 SubSystem Introduction User s Manual 1 6 V 1 6 2001 08...
Страница 126: ...User s Manual C166S V1 SubSystem Central Processing Unit User s Manual 3 96 V 1 6 2001 08...
Страница 178: ...User s Manual C166S V1 SubSystem Memory Organization User s Manual 4 52 V 1 6 2001 08...
Страница 206: ...User s Manual C166S V1 SubSystem Instruction Set User s Manual 5 28 V 1 6 2001 08...
Страница 306: ...User s Manual C166S V1 SubSystem Detailed Instruction Set User s Manual 6 100 V 1 6 2001 08...
Страница 362: ...User s Manual C166S V1 SubSystem The External Bus Interface User s Manual 8 40 V 1 6 2001 08...
Страница 452: ...User s Manual C166S V1 SubSystem General Purpose Timer Unit User s Manual 12 44 V 1 6 2001 08...
Страница 454: ...User s Manual C166S V1 SubSystem Instruction Index User s Manual 13 2 V 1 6 2001 08...
Страница 459: ......