45111 datasheet(122/184 Pages) ETC2

122 / 184 page

13 Appendix C: SX Instruction Set

Page 122

• SX-Key/Blitz Development System Manual 2.0 • Parallax, Inc.

The Affects column indicates the flags and registers the given instruction may affect. Depending on the

kind of instruction, flags and/or registers are always affected, or only on certain results of the

instruction. Table 27 - Flags and Registers, below, describes these flags and registers.

Table 27 - Flags and Registers

Symbol

Definition

The carry flag

The digit-carry flag

FSR

The file select register

The file register

The mode register

op.bit

The specified bit of the specified operand

OPT

The options register

The program counter

The power-down flag

!port

The specified I/O port data direction register

The time-out flag

The working register

The zero flag

The Coding column indicates how the given command will assemble, including binary values and

mnemonic instructions. Some commands assemble into multiple, simpler commands. Table 28 - Binary

Symbols

, below, describes the binary symbols.

Table 28 - Binary Symbols

Symbol

Definition

Bit address

File register address

Constant

Any instruction that performs a skip will only skip one instruction word. To avoid strange results, care must be

taken to make sure that a single word instruction immediately follows the skipping instruction.

An exception to this rule are skip instructions that are immediately followed by a BANK or PAGE

instruction. Here (provided that the tested condition is true), two instructions will be skipped, i.e. the

BANK or PAGE instruction plus the next one. This is useful for conditional branching to another page

where a PAGE instruction precedes a JMP. If several PAGE and BANK instructions immediately follow

a skip instruction then they are all skipped plus the next instruction and a clock cycle is consumed for

each.

Many instructions are adversely affected by the carry flag when CARRYX (Add/Sub with C) is specified. Be

careful to follow the special notes within the instruction descriptions concerning this.

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