SX28ACSLASHSS datasheet(36/51 Pages) PARALLAX

36 / 51 page

Parallax SX20AC/SX28AC

www.parallax.com

Page 36 of 51

Rev 1.6 11/20/2006

Table 16-2: Native SX Instruction Set: Arithmetic and Shift Operations

Mnemonic,

Operands

Description

Clock Cycles

(Slow Mode)

Clock Cycles

(Turbo)

Opcode

Bits

Affected

ADD fr,W

Add W to fr (fr = fr + W); carry bit is added if CF

bit in FUSEX register is cleared to 0

0001 111f ffff

C, DC, Z

ADD W,fr

Add fr to W (W = W +fr); carry bit is added if CF

bit in FUSEX register is cleared to 0

0001 110f ffff

C, DC, Z

CLR fr

Clear fr (fr = 0)

0000 011f ffff

CLR W

Clear W (W = 0)

0000 0100 0000

CLR !WDT

Clear Watchdog Timer, clear prescaler if

assigned to the Watchdog (TO = 1, PD = 1)

0000 0000 0100

TO, PD

DEC fr

Decrement fr (fr = fr – 1)

0000 111f ffff

DECSZ fr

Decrement fr and Skip if Zero (fr = fr – 1 and skip

next instruction if result is zero)

4 or 8 (skip)

1 or 2 (skip)

0010 111f ffff

none

INC fr

Increment fr (fr = fr +1)

0010 101f ffff

INCSZ fr

Increment fr and Skip if Zero (fr = fr +1 and skip

next instruction if result is zero)

4 or 8 (skip)

1 or 2 (skip)

0011 111f ffff

none

RL fr

Rotate fr Left through Carry (fr = << fr)

0011 011f ffff

RR fr

Rotate fr Right through Carry (fr = >> fr)

0011 001f ffff

SUB fr,W

Subtract W from fr (fr = fr – W); complement of

the carry bit is subtracted if CF bit in FUSEX

0000 101f ffff

C, DC, Z

SWAP fr

Swap high/low nibbles so fr xy = yx (fr = <> fr)

0011 101f ffff

none

Table 16-3: Native SX Instruction Set: Bitwise Operations

Mnemonic,

Operands

Description

Clock Cycles

(Slow Mode)

Clock Cycles

(Turbo)

Opcode

Bits

Affected

CLRB fr.bit

Clear Bit in fr (fr.bit = 0)

0100 bbbf ffff

none

SB fr.bit

Test Bit in fr and Skip if set (test fr.bit and skip

next instruction if bit is 1)

4 or 8 (skip)

1 or 2 (skip)

0111 bbbf ffff

none

SETB fr.bit

Set Bit in fr (fr.bit = 1)

0101 bbbf ffff

none

SNB fr.bit

Test Bit in fr and Skip if clear ( test fr.bit and skip

next instruction if bit is 0)

4 or 8 (skip)

1 or 2 (skip)

0110 bbbf ffff

none

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