DS80C320-ECD DALLAS [Dallas Semiconductor], DS80C320-ECD Datasheet - Page 49

• Manufacturer Part Number: DS80C320-ECD
• Description: High-Speed Microcontroller User Guide
• Manufacturer: DALLAS [Dallas Semiconductor]

Program Status Word (PSW)
SFR D0h
CY
Bit 7
AC
Bit 6
F0
Bit 5
RS1, RS0
Bits 4-3
OV
Bit 2
F1
Bit 1
PARITY
Bit 0
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset
RW-0
CY
7
RS1
0
0
1
1
Carry Flag. This bit is set when if the last arithmetic operation resulted in a
carry (during addition) or a borrow (during subtraction). Otherwise it is cleared
to 0 by all arithmetic operations.
Auxiliary Carry Flag. This bit is set to 1 if the last arithmetic operation
resulted in a carry into (during addition), or a borrow (during subtraction) from
the high order nibble. Otherwise it is cleared to 0 by all arithmetic operations.
User Flag 0. This is a bit-addressable, general purpose flag for software control.
Register Bank Select 1–0. These bits select which register bank is addressed
during register accesses.
Overflow Flag. This bit is set to 1 if the last arithmetic operation resulted in a
carry (addition), borrow (subtraction), or overflow (multiply or divide).
Otherwise it is cleared to 0 by all arithmetic operations.
User Flag 1. This is a bit-addressable, general purpose flag for software control.
Parity Flag. This bit is set to 1 if the modulo-2 sum of the eight bits of the
accumulator is 1 (odd parity); and cleared to 0 on even parity.
RW-0
AC
6
RW-0
F0
5
RS0
0
1
0
1
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RW-0
RS1
4
REGISTER BANK
RW-0
RS0
3
0
1
2
3
High-Speed Microcontroller User’s Guide
RW-0
0V
2
ADDRESS
00h – 07h
08h – 0Fh
10h – 17h
18h – 1Fh
RW-0
F1
1
PARITY
RW-0
0