HCS12 datasheet(394/452 Pages) FREESCALE

394 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

394

Freescale Semiconductor

WAV

Calculate Sum of Products and Sum of Weights for Weighted

Average Calculation

Initialize B, X, and Y before WAV. B specifies number of ele-

ments. X points at first element in Si list. Y points at first ele-

ment in Fi list.

All Si and Fi elements are 8-bits.

If interrupted, six extra bytes of stack used for

intermediate values

Special

18 3C

Of(frr,ffff)O

Off(frr,fffff)O

– – ? –

∆ ? ?

(add if interrupt)

SSS + UUUrr,

SSSf + UUUrr

wavr

pseudo-

instruction

see WAV

Resume executing an interrupted WAV instruction (recover in-

termediate results from stack rather than initializing them to

zero)

Special

UUUrr,ffff

(frr,ffff)O

UUUrrfffff

(frr,fffff)O

– – ? –

∆ ? ?

(exit + re-entry replaces comma

above if interrupted)

SSS + UUUrr,

SSSf + UUUrr

XGDX

(D)

⇔ (X)

Translates to EXG D, X

INH

B7 C5

– – – –

XGDY

(D)

⇔ (Y)

Translates to EXG D, Y

INH

B7 C6

– – – –

Table A-1. Instruction Set Summary (Sheet 14 of 14)

Source Form

Operation

Addr.

Mode

Machine

Coding (hex)

Access Detail

S X H I

N Z V C

HCS12

M68HC12

∑ X

⇒

∑

Y:D

⇒

and

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