Samsung C8278X User Manual
CONTROL REGISTERS
S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
4-4
FLAGS - System Flags Register
.7
Carry Flag (C)
.6
Zero Flag (Z)
.5
Bit Identifier
Reset Value
Read/Write
Bit Addressing
Mode
R = Read-only
W = Write-only
R/W = Read/write
'-' = Not used
W = Write-only
R/W = Read/write
'-' = Not used
Type of addressing
that must be used to
address the bit
(1-bit, 4-bit, or 8-bit)
that must be used to
address the bit
(1-bit, 4-bit, or 8-bit)
nRESET value notation:
'-' = Not used
'x' = Undetermined value
'0' = Logic zero
'1' = Logic one
'-' = Not used
'x' = Undetermined value
'0' = Logic zero
'1' = Logic one
Bit number(s) that is/are appended to
the register name for bit addressing
the register name for bit addressing
Name of individual
bit or related bits
bit or related bits
Full Register name
Register ID
Sign Flag (S)
0
Operation does not generate a carry or borrow condition
1
Operation generates carry-out or borrow into high-order bit 7
0
Operation result is a non-zero value
1
Operation result is zero
0
Operation generates positive number (MSB = "0")
1
Operation generates negative number (MSB = "1")
Description of the
effect of specific
bit settings
effect of specific
bit settings
Set 1
Register location
in the internal
register file
in the internal
register file
D5H
Register address
(hexadecimal)
(hexadecimal)
.7
.6
.5
x
x
x
R/W
R/W
R/W
Register addressing mode only
.4
.3
.2
.1
.0
x
R/W
x
R/W
x
R/W
x
R/W
0
R/W
Bit number:
MSB = Bit 7
LSB = Bit 0
MSB = Bit 7
LSB = Bit 0
Figure 4-1. Register Description Format