BS2824 Holtek Semiconductor Inc., BS2824 Datasheet - Page 23

• Manufacturer Part Number: BS2824
• Description: Touch Key Mcu
• Manufacturer: Holtek Semiconductor Inc.

Rev. 1.00
STATUS Register
specify which pins are outputs and which are inputs before reading data from or writing data to the
I/O ports. One flexible feature of these registers is the ability to directly program single bits using the
vice versa by manipulating specific bits of the I/O control registers during normal program operation
is a useful feature of these devices.
SET [m].i and CLR [m].i instructions. The ability to change I/O pins from output to input and
Bit 7, 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
POR
R/W
Bit
Unimplemented, read as 0
TO: Watchdog Time-Out flag
PDF: Power down flag
OV: Overflow flag
Z: Zero flag
AC: Auxiliary flag
C: Carry flag
C is also affected by a rotate through carry instruction.
0: After power up or executing the CLR WDT or HALT instruction
1: A watchdog time-out occurred.
0: After power up or executing the CLR WDT instruction
1: By executing the HALT instruction
0: no overflow
1: an operation results in a carry into the highest-order bit but not a carry out of the
0: The result of an arithmetic or logical operation is not zero
1: The result of an arithmetic or logical operation is zero
0: no auxiliary carry
1: an operation results in a carry out of the low nibbles in addition, or no borrow from
0: no carry-out
1: an operation results in a carry during an addition operation or if a borrow does not
7
highest-order bit or vice versa.
the high nibble into the low nibble in subtraction
take place during a subtraction operation
6
TO
R
5
0
23
BS2824/BS2854/BS2868
PDF
R
4
0
R/W
OV
3
x
Touch Key MCU
R/W
2
Z
x
R/W
AC
1
x
January 27, 2010
x unknown
R/W
C
0
x