S3F84B8_UM_REV 1.00 4 CONTROL REGISTERS
4-4
FLAGS
- System Flags Register
.7
.6
.5
Bit Identifier
RESET Value
Read/Write
R = Read-only
W = Write-only
R/W = Read/write
' - ' = Not used
Bit number:
MSB = Bit 7
LSB = Bit 0
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
register name for bit addressing
D5H
Register address
(hexadecimal)
Register name
Register
ID
Name of individual
bit or related bits
x
R/W
x
R/W
x
R/W
x
R/W
0
R/W
x
R/W
0
R/W
x
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")
.7 .6 .5 .4 .2.3 .1 .0
Figure 4-1 Register Description Format
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