Holtek BS66F340 - Bit 7 6 5 4 3 2

Rev. 1.60 62 August 20, 2019 Rev. 1.60 63 August 20, 2019
BS66F340/BS66F350/BS66F360/BS66F370
Touch A/D Flash MCU with LED Driver
BS66F340/BS66F350/BS66F360/BS66F370
Touch A/D Flash MCU with LED Driver
• STATUS Register
Bit 7 6 5 4 3 2 1 0
Name SC CZ TO PDF OV Z AC C
R/W R R R R R/W R/W R/W R/W
POR x x 0 0 x x x x
"x": unknown
Bit 7 SC: The result of the "XOR" operation which is performed by the OV ag and the
MSB of the instruction operation result.
Bit 6 CZ: The the operational result of different ags for different instuctions.
For SUB/SUBM/LSUB/LSUBM instructions, the CZ ag is equal to the Z ag.
For SBC/ SBCM/ LSBC/ LSBCM instructions, the CZ ag is the "AND" operation
result which is performed by the previous operation CZ ag and current operation zero
ag. For other instructions, the CZ ag willl not be affected.
Bit 5 TO: Watchdog Time-out ag
0: After power up ow executing the "CLR WDT" or "HALT" instruction
1: A watchdog time-out occurred
Bit 4 PDF: Power down ag
0: After power up ow executing the "CLR WDT" instruction
1: By executing the "HALT" instructin
Bit 3 OV: Overow ag
0: No overow
1: An operation results in a carry into the highest-order bit but not a carry out of the
highest-order bit or vice versa
Bit 2 Z: Zero ag
0: The result of an arithmetic or logical operation is not zero
1: The result of an arithmetic or logical operation is zero
Bit 1 AC: Auxiliary ag
0: No auxiliary carry
1: An operation results in a carry out of the low nibbles, in addition, or no borrow
from the high nibble into the low nibble in substraction
Bit 0 C: Carry ag
0: No carry-out
1: An operation results in a carry during an addition operation or if a borrow does
not take place during a subtraction operation
The "C" ag is also affected by a rotate through carry instruction.