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CONTROL REGISTERS
Bit number(s) that is/are appended to
the register name for bit addressing
Register ID
FLAGS - System Flags Register
Bit Identifier
RESET Value
RESET
Read/Write
Bit Addressing Mode
.7
.6
.5
R = Read-only
W = Write-only
R/W = Read/write
'-' = Not used
Addressing mode or
modes you can use
to modify register
values
4-4
Name of individual
bit or related bits
Register name
.7
.6
.5
x
x
x
R/W
R/W
R/W
Register addressing mode only
Carry Flag (C)
Operation does not generate a carry or borrow condition
0
Operation generates carry-out or borrow into high-order bit 7
0
Zero Flag (Z)
Operation result is a non-zero value
0
Operation result is zero
0
Sign Flag (S)
Operation generates positive number (MSB = "0")
0
Operation generates negative number (MSB = "1")
0
Figure 4-1. Register Description Format
Register address
(hexadecimal)
.4
.3
x
x
R/W
R/W
Description of the
effect of specific
bit settings
S3P80C5/C80C5/C80C8
Register location
in the internal
register file
D5H
Set 1
.2
.1
.0
x
x
0
R/W
R/W
R/W
RESET value notation:
'-' = Not used
'x' = Undetermined value
'0' = Logic zero
'1' = Logic one
Bit number:
MSB = Bit 7
LSB = Bit 0
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