HEIDENHAIN TNC 306 Technical Manual - Manual (Page 375)

3/2000
TNC 416/TNC 406/TNC 306 Commands 7-85
3.10.2 BIT RESET (BC, BCX) BC
Abbreviation for PLC Editor: BC (BIT CLEAR)
Byte/Word/Double Constant
Execution time [µs] 2.2 to 2.6 2.2
Number of bytes 6 8
Operands: B, W, D, K, X
Operation:
With this command, each bit in the Accumulator can be acted on. The addressed bit is set to "0"
through the use of the BC command. The selection (addressing) of the corresponding bit is derived
from the content of the specified Operand or a Constant. In the bit-numbering, bit 0 corresponds to
the LSB and bit 31 the MSB. For operand contents larger than 32, the operand value Modulo 32 is
used, i.e. the integer remainder from the division (operand value)/32.
Example:
Load Double word D8 in the Accumulator, set bit 0 of the Accumulator to "0" and store the result in
Double word D12.
Initial state: Double word D8 = 3E 81 (hex)
Double word D12 = ?
Accumulator and operand contents are shown here in hexadecimal notation.
Line Instruction Accumulator content Operand content
xx xx xx xx
1 L D8 00 00 3E 81 00 00 3E 81
2 BC K+0 00 00 3E 80
3 = D12 00 00 3E 80 00 00 3E 80
Line 1: Load Double word D8 into the Accumulator.
Line 2: The bit specified in the operand is set to "0".
Line 3: The result is stored in Double word D12.