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S3F84B8_UM_REV 1.00
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
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 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
Register Description Format
4-4
4 CONTROL REGISTERS
D5H
.2
.1
.0
x
0
0
R/W
R/W
R/W
Bit number:
MSB = Bit 7
LSB = Bit 0
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