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Bit Clear

Set specified bit of stored integer to zero

  • Bit Clear block

Simulink / Logic and Bit Operations
HDL Coder / Logic and Bit Operations


The Bit Clear block sets the specified bit, given by its index, of the stored integer to zero. Scaling is ignored.

You can specify the bit to be set to zero with the Index of bit parameter, where bit zero is the least significant bit.


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If the Bit Clear block is turned on for bit 2, bit 2 is set to 0.

A vector of constants 2.^[0 1 2 3 4] is represented in binary as [00001 00010 00100 01000 10000].

With bit 2 set to 1, the result is [00101 00110 00100 01100 10100], which is represented in decimal as [5 6 4 12 20].

With bit 2 set to 0, the result is [00001 00010 00000 01000 10000], which is represented in decimal as [1 2 0 8 16]


The Bit Clear block supports Simulink® integer, fixed-point, and Boolean data types. The block does not support true floating-point data types or enumerated data types.


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The input signal is the specified bit of the stored integer.

Data Types: single | double | Boolean | fixed point


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The output consists of the specified bit set to zero.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | enumerated | bus


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Index of bit where bit 0 is the least significant bit.

Programmatic Use

Block Parameter: iBit
Type: scalar or vector
Values: {'0'}
Default: '0'

Block Characteristics

Data Types

Booleana | fixed point | integer

Direct Feedthrough


Multidimensional Signals


Variable-Size Signals


Zero-Crossing Detection


a Bit operations are not recommended for use with Boolean signals.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

PLC Code Generation
Generate Structured Text code using Simulink® PLC Coder™.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Version History

Introduced before R2006a

See Also

| | (HDL Coder) | (HDL Coder)