Samsung S3F80JB manual Flags System Flags Register D5H Set1 Bank0

S3F80JBCONTROL REGISTERS

FLAGS — System Flags Register D5H Set1 Bank0

Bit Identifier

Reset Value

Read/Write

Addressing Mode

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

Register addressing mode only

.7	Carry Flag Bit (C)
	0	Operation does not generate a carry or borrow condition
	1	Operation generates a carry-out or borrow into high-order bit 7
.6	Zero Flag Bit (Z)
	0	Operation result is a non-zero value
	1	Operation result is zero
.5	Sign Flag Bit (S)
	0	Operation generates a positive number (MSB = "0")
	1	Operation generates a negative number (MSB = "1")
.4	Overflow Flag Bit (V)
	0	Operation result is	≤ +127	or	≥ –128
	1	Operation result is	> +127	or	< –128
.3	Decimal Adjust Flag Bit (D)

0Add operation completed

1Subtraction operation completed

.2	Half-Carry Flag Bit (H)
	0	No carry-out of bit 3 or no borrow into bit 3 by addition or subtraction
	1	Addition generated carry-out of bit 3 or subtraction generated borrow into bit 3
.1	Fast Interrupt Status Flag Bit (FIS)
	0	Interrupt return (IRET) in progress (when read)
	1	Fast interrupt service routine in progress (when read)
.0	Bank Address Selection Flag Bit (BA)
	0	Bank 0 is selected
	1	Bank 1 is selected

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