PS081 datasheet(131/155 Pages) AMSCO

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6-28

PSØ81

shiftL

Shift Left

Syntax:

shiftL p1,(p2)

Parameters:

p1 = ACCU [x,y,z,r]

p2 = 4-Bit number or none

Calculus:

p1 := p1<< 1; carry :=MSB(x)

(in case rotL p1, without p2)

p1 := repeat (p2) shiftL p1

(in case rotL p1,p2)

Flags affected:

C O S Z

Bytes:

1 (p1=ACCU, p2=none)

2 (p1=ACCU, p2=NUMBER)

Cycles:

1 (p1=ACCU, p2=none)

1 + p2 (p1=ACCU, p2=NUMBER)

Description:

Shift p1 left --> shift p1 register to the left, fill LSB with 0, MSB is placed in carry

Shift p1 left p2 times --> shift p1 register p2 times to the left, in each step fill LSB

with the 0 and place the MSB in the carry

Category:

Shift and rotate

setLCD

Set LCD

Syntax:

setLCD

Parameters:

Calculus:

Flags affected:

Bytes:

Cycles:

Subroutine call

Description:

Sets all LCD register 61 & 62 bits to 1.

Use this opcode in combination with ‚newlcd‘ for showing all LCD segments.

In real a subroutine in the ROM code is called. The assembler converts this com-

mand to the corresponding jump command.

Category:

LCD Display

shiftR

Shift right

Syntax:

shiftR p1,(p2)

Parameters:

p1 = ACCU [x,y,z,r]

p2 = 4-Bit number or none

Calculus:

p1 := p1>> 1; carry:=MSB(x) (in case rotL p1, without p2)

p1 := repeat (p2) shiftL p1 (in case rotL p1,p2)

Flags affected:

C O S Z

Bytes:

1 (p1=ACCU, p2=none)

2 (p1=ACCU, p2=NUMBER)

Cycles:

1 (p1=ACCU, p2=none)

1 + p2 (p1=ACCU, p2=NUMBER)

Description:

Signed shift right of p1 --> shift p1 right, MSB is duplicated according to whether

the number is positive or negative

Signed shift p1 right p2 times --> shift p1 register p2 times to the right, MSB is

duplicated according to whether the number is positive or negative

Category:

Shift and rotate

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