45111 datasheet(142/184 Pages) ETC2

142 / 184 page

13 Appendix C: SX Instruction Set

Page 142

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

SUB

dest, src

Subtract src from dest

Command

Words

Cycles

Affects

Coding

1) SUB

fr, W

1 (4)

fr, C, DC, Z

0000 101f ffff SUB fr, W

2) SUB

fr1, #literal

2 (8)

fr, W, C, DC, Z

1100 kkkk kkkk MOV W, #lit

0000 101f ffff SUB fr, W

3) SUB

fr1, fr2

2 (8)

fr, W, C, DC, Z

0010 000f ffff MOV W, fr

0000 101f ffff SUB fr, W

Operation: src is subtracted from dest. C will be cleared to 0 if an underflow occurred; otherwise, C will be set to 1.

DC will be cleared to 0 if an underflow occurred in the least-significant nibble. Z will be set to 1 if the

result was 0; otherwise, Z will be cleared to 0. The MOV W, fr-W command is similar to #1, except the

result is moved to W, and fr keeps its original contents. If CARRYX is specified, c is added to the result.

Insert an STC before the first Sub on a register to avoid strange results.

SUBB

dest, src_bit

Subtract src_bit from dest

Command

Words

Cycles

Affects

Coding

1) SUBB

fr, op.bit

2 (8)

fr, Z

0110 bbbf ffff SNB op.bit

0000 111f ffff DEC fr

1) SUBB

fr, /op.bit

2 (8)

fr, Z

0111 bbbf ffff SB

op.bit

0000 111f ffff DEC fr

Operation: Subtracts src_bit from dest. If dest was decremented, Z will be set if the result was zero; else, Z will be

cleared. This instruction is useful for subtracting the carry from the upper byte of a double-byte value

after the lower byte has been subtracted.

SWAP

dest

Swap nibbles in dest

Command

Words

Cycles

Affects

Coding

1) SWAP

1 (4)

0011 101f ffff SWAP fr

Operation: The high- and low-order nibbles of dest are swapped. The MOV W,<>fr command is similar to SWAP

fr, except the result is moved to W, and fr keeps its original contents.

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