Samsung S3C9228/P9228, 8-Bit CMOS Microcontroller user manual Register Description Format

CONTROL REGISTERS S3C9228/P9228

Bit number(s) that is/are appended to the register name for bit addressing

Register		Name of individual			Register address
		bit or bit function
mnemonic	Full Register name				(hexadecimal)
FLAGS - System Flags Register						D5H
Bit Identifier	.7	.6	.5	.4	.3	.2	.1	.0
RESET Value	x	x	x	x	x	x	0	0
Read/Write	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
.7	Carry Flag (C)

0Operation dose not generate a carry or borrow condition

1Operation generates carry-out or borrow into high-order bit7

.6 Zero Flag

0Operation result is a non-zero value

1Operation result is zero

.5		Sign Flag
		0	Operation generates positive number (MSB = "0")
		1	Operation generates negative number (MSB = "1")
	R = Read-only				RESET value notation:
				Description of the
	W = Write-only			effect of specific	'-' = Not used
	R/W = Read/write			bit settings	'x' = Undetermind value
	' - ' = Not used				'0' = Logic zero
Addressing mode or					'1' = Logic one	Bit number:
modes you can use to						MSB = Bit 7
modify register values						LSB = Bit 0

Figure 4-1. Register Description Format

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