C8051F124-TB Silicon Laboratories Inc, C8051F124-TB Datasheet - Page 152
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C8051F124-TB
Manufacturer Part Number
C8051F124-TB
Description
BOARD PROTOTYPING W/C8051F124
Manufacturer
Silicon Laboratories Inc
Specifications of C8051F124-TB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
152
Bit7:
Bit6:
Bit5:
Bits4–3: RS1–RS0: Register Bank Select.
Bit2:
Bit1:
Bit0:
R/W
CY
Bit7
CY: Carry Flag.
This bit is set when the last arithmetic operation resulted in a carry (addition) or a borrow
(subtraction). It is cleared to 0 by all other arithmetic operations.
AC: Auxiliary Carry Flag
This bit is set when the last arithmetic operation resulted in a carry into (addition) or a borrow
from (subtraction) the high order nibble. It is cleared to 0 by all other arithmetic operations.
F0: User Flag 0.
This is a bit-addressable, general purpose flag for use under software control.
These bits select which register bank is used during register accesses.
OV: Overflow Flag.
This bit is set to 1 under the following circumstances:
• An ADD, ADDC, or SUBB instruction causes a sign-change overflow.
• A MUL instruction results in an overflow (result is greater than 255).
• A DIV instruction causes a divide-by-zero condition.
The OV bit is cleared to 0 by the ADD, ADDC, SUBB, MUL, and DIV instructions in all other
cases.
F1: User Flag 1.
This is a bit-addressable, general purpose flag for use under software control.
PARITY: Parity Flag.
This bit is set to 1 if the sum of the eight bits in the accumulator is odd and cleared if the sum
is even.
RS1
0
0
1
1
R/W
AC
Bit6
SFR Definition 11.9. PSW: Program Status Word
RS0
0
1
0
1
R/W
Bit5
F0
Register Bank
RS1
R/W
Bit4
0
1
2
3
Rev. 1.4
RS0
R/W
Bit3
0x00–0x07
0x08–0x0F
0x10–0x17
0x18–0x1F
Address
R/W
OV
Bit2
R/W
Bit1
F1
SFR Address:
PARITY 00000000
SFR Page:
Bit0
R
0xD0
All Pages
Addressable
Reset Value
Bit
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