Samsung S3C9454B User Manual page 51

CONTROL REGISTERS
Bit number(s) that is/are appended to the
register name for bit addressing
Register
ID
FLAGS
Bit Identifier
RESET Value
Read/Write
.7
.6
.5
4-4
Name of individual
bit or related bits
Register name
- System Flags Register
.7 .6
x x
R/W 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")
R = Read-only
W = Write-only
R/W = Read/write
' - ' = Not used
Figure 4-1. Register Description Format
Register address
(hexadecimal)
.5 .4 .3
x x x
R/W R/W R/W
Description of the
RESET value notation:
effect of specific '-' = Not used
bit settings
'x' = Undetermind value
'0' = Logic zero
'1' = Logic one
S3C9454B/F9454B
D5H
.2 .1 .0
x 0 0
R/W R/W R/W
Bit number:
MSB = Bit 7
LSB = Bit 0