Samsung S3C9228/P9228, 8-Bit CMOS Microcontroller user manual Flags System Flags Register

CONTROL REGISTERSS3C9228/P9228

FLAGS — System Flags Register D5H

Bit Identifier

RESET Value

Read/Write

.7

.6

.5

.4

.7	.6	.5	.4	.3	.2	.1	.0
x	x	x	x	–	–	–	–
R/W	R/W	R/W	R/W	–	–	–	–

Carry Flag (C)

0 Operation does not generate a carry or borrow condition

Zero Flag (Z)

0Operation result is a non-zero value

1Operation result is zero

Sign Flag (S)

0Operation generates a positive number (MSB = "0")

1Operation generates a negative number (MSB = "1")

Overflow Flag (V)

0	Operation result is	≤	+127	or	≥ –128
1	Operation result is	≥ +127		or	≤ –128

.3-.0

Not used for S3C9228/P9228

4-8