SX User’s Manual Rev. 3.1 66 © 2000 Scenix Semiconductor, Inc. All rights reserved. www.scenix.com Chapter 3 Instruction Set Table 3-8  Key to Abbreviations and Symbols Symbol Description W Working register fr File register value (a 5-bit file register address specified in the instruction) PC Lower eight bits of program counter (global file register 02h) STATUS STATUS register (global file register 03h) FSR File Select Register (global file register 04h) C Carry bit in STATUS register (bit 0) DC Digit Carry bit in STATUS register (bit 1) Z Zero bit in STATUS register (bit 2 PD Power Down bit in STATUS register (bit 3) TO Watchdog Timeout bit in STATUS register (bit 4) PA2:PA0 Page select bits in STATUS register (bits 7:5) OPTION OPTION register (not memory-mapped) WDT Watchdog Timer register (not memory-mapped) MODE MODE register (not memory-mapped) rx Port control register pointer (RA, RB, RC, RD, or RE) ! Non-memory-mapped register designator f File register address bit in opcode k Constant value bit in opcode n Numerical value bit in opcode b Bit position selector bit in opcode . File register / bit selector separator in assembly language instruction # Immediate literal designator in assembly language instruction lit Literal value in assembly language instruction addr8 8-bit address in assembly language instruction addr9 9-bit address in assembly language instruction addr12 12-bit address in assembly language instruction / Logical 1’s complement | Logical OR ^ Logical exclusive OR & Logical AND <> Swap high and low nibbles (4-bit segments) << Rotate left through carry bit >> Rotate right through carry bit - - Decrement file register ++ Increment file register