PS081 datasheet(129/155 Pages) AMSCO

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PSØ81

rollAvg

Calculate rolling average

Syntax:

rollAvg p1,p2

Parameters:

p1 = ACCU[x]

p2 = number from 3 to 17

Calculus:

ACCU[y] = ACCU[x] old

p1 = rolling average result

Flags affected:

Bytes:

Cycles:

Subroutine call

Description:

Feeds p1 as new value into the rolling average subroutine. p2 defines the number

of data points for the rolling average. The value falling out of the rolling average is

stored on RAM address 13. The result is stored in the x ACCU. The previous result

is stored in the y ACCU.

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

mand to the corresponding jump command.

Category:

Miscellaneous

rotL

Rotate left

Syntax:

rotL p1(,p2)

Parameters:

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

p2 = 4-Bit number or none

Calculus:

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

(in case rotL p1, without p2)

p1 := repeat (p2) rotL p1

(in case rotL p1,p2)

Flags affected:

C O S Z (of the last step)

Bytes:

1 (p1=ACCU, p2=none)

2 (p1=ACCU, p2=NUMBER)

Cycles:

1 (p1=ACCU, p2=none)

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

Description:

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

carry register

Rotate p1 left p2 times with carry --> shift p1 register p2 times to the left, in each

step fill LSB with the carry and place the MSB in the carry

Category:

Shift and rotate

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