Samsung 8-Bit Manual do Utilizador descarregar pdf (Página 276)

100

101

CONTROL REGISTERS S3C9228/P9228

4-4

FLAGS - System Flags Register

Bit Identifier

RESET RESET Value

Read/Write

R = Read-only

W = Write-only

R/W = Read/write

' - ' = Not used

Bit number:

MSB = Bit 7

LSB = Bit 0

Addressing mode or

modes you can use to

modify register values

Description of the

effect of specific

bit settings

RESET value notation:

'-' = Not used

'x' = Undetermind value

'0' = Logic zero

'1' = Logic one

Bit number(s) that is/are appended to the

D5H

(hexadecimal)

Full Register name

mnemonic

Name of individual

bit or bit function

.7 .6 .5 .4 .2.3 .1 .0

R/W

Carry Flag (C)

0 Operation dose not generate a carry or borrow condition

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

Zero Flag

0 Operation result is a non-zero value

1 Operation result is zero

Sign Flag

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

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

Figure 4-1. Register Description Format

1 2 ... 271 272 273 274 275 276 277 278 279 280 281 ... 461 462

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