Table of Contents
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SUBB
Syntax
Operation
Data Types
Description
Performs a 2's complement binary subtraction of the source operand specified by op2 from the destina-
tion operand specified by op1. The result is then stored in op1.
Flags
E
*
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, ie. the result cannot be represented in the specified
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.
Addressing Modes
Mnemonic
SUBB
SUBB
SUBB
SUBB
SUBB
SUBB
SUBB
Integer Subtraction
SUBB
(op1)
BYTE
Z
*
Rb
, Rb
n
m
Rb
, [Rw
]
n
i
Rb
, [Rw
+]
n
i
Rb
, #data
n
3
reg, #data
16
reg, mem
mem, reg
ST10 FAMILY PROGRAMMING MANUAL
op1, op2
<-- (op1) - (op2)
V
*
Format
21 nm
29 n:10ii
29 n:11ii
29 n:0###
27 RR ## ##
23 RR MM MM
25 RR MM MM
C
N
S
*
Bytes
2
2
2
2
4
4
4
117/172
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