# Vault 7: Projects

This publication series is about specific projects related to the Vault 7 main publication.

### Protego

# PIC24FJ64GA004 - Programmers Reference Manual

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16-bit MCU and DSC Programmer’s Reference Manual
DS70157F-page 164 © 2005-2011 Microchip Technology Inc.
BTSS
Bit Test f, Skip if Set
Implemented in: PIC24F PIC24H PIC24E dsPIC30F dsPIC33F dsPIC33E
X X X X X X
Syntax: {label:} BTSS{.B} f, #bit4
Operands: f ∈ [0 ... 8191] for byte operation
f ∈ [0 ... 8190] (even only) for word operation
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for word operation
Operation: Test (f)<bit4>, skip if set
Status Affected: None
Encoding: 1010 1110 bbbf ffff ffff fffb
Description: Bit ‘bit4’ in the file register ‘f’ is tested. If the tested bit is ‘1’, the next
instruction (fetched during the current instruction execution) is discarded
and on the next cycle, a NOP is executed instead. If the tested bit is ‘0’, the
next instruction is executed as normal. In either case, the contents of the
file register are not changed. For the bit4 operand, bit numbering begins
with the Least Significant bit (bit 0) and advances to the Most Significant
bit (bit 7 for byte operation, bit 15 for word operation).
The ‘b’ bits select value bit4, the bit position to test.
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the file register
address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words: 1
Cycles:
1 (2 or 3 if the next instruction is skipped)
(1)
Note 1:
In dsPIC33E and PIC24E devices, the listed cycle count does not apply to read and
read-modify-write operations on non-CPU Special Function Registers. For more
details, see
Note 3
in
Section 3.2.1 “Multi-Cycle Instructions”
.

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