PS081 datasheet(136/155 Pages) AMSCO

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6-33

PSØ81

sub

Substraction

Syntax:

sub p1,p2

Parameters:

p1 = NUMBER[1,2,3]

p2 = NUMBER[1,2,3] or 24-Bit number

Calculus:

p1:= p2 – p1

Flags affected:

C O S Z

Bytes:

1 (p1=ACCU, p2=ACCU)

4 (p1=ACCU, p2=NUMBER)

Cycles:

1 (p1=ACCU, p2=ACCU)

4 (p1=ACCU, p2=NUMBER)

Description:

Subtraction of 2 registers

Subtraction of register from constant

Category:

Simple arithmetic

swap

Swap

Syntax:

swap p1,p2

Parameters:

p1 = ACCU [x,y,r]

p2 = ACCU [x,y,r]

Calculus:

p1 := p2 and p2 := p1

Flags affected:

Bytes:

Cycles:

Description:

Swap of 2 registers

The value of two registers is exchanged between each other.

Not possible with ACCU[z]

Category:

RAM Access

useEprInit

Initialize User - EEPROM

Syntax:

usrEprInit p1, p2

Parameters:

p1 = EEPROM CELL [0 to 15]

p2 = NUMBER [24-bit]

Calculus:

EEPROM (p1) = p2

Flags affected:

Bytes:

Cycles:

Description:

This opcode initializes the User programmable EEPROM space from address 2000

to 2047. In total there are 16 EEPROM cells á 24-bit programmable.

Please note: This opcode is only for INITIALIZATION. For writing / reading from the

user EEPROM cells from the program you have to use putepr / getepr opcodes

Category:

EEPROM access

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