Samsung S3C9444 User Manual page 53

CONTROL REGISTERS
FLAGS
— System Flags Register
Bit Identifier
RESET Value
Read/Write
.7
.6
.5
.4
.3–.0
4-8
.7 .6
x x
R/W R/W
Carry Flag (C)
0 Operation does not generate a carry or borrow condition
1 Operation generates a carry-out or borrow into high-order bit 7
Zero Flag (Z)
0 Operation result is a non-zero value
1 Operation result is zero
Sign Flag (S)
0 Operation generates a positive number (MSB = "0")
1 Operation generates a negative number (MSB = "1")
Overflow Flag (V)
Operation result is ≤ + 127 or _ – 128
0
1 Operation result is > + 127 or < – 128
Not used for S3C9444
.5 .4
x x
R/W R/W
S3C9444/F9444_UM_REV1.10
.3 .2 .1
– – –
– – –
D5H
.0
–
–