Motorola MC68340 User Manual page 172

Integrated processor with dma

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First, the results of each TBL are rounded with the TBLS round-to-nearest-even algorithm.

The following values would be returned by TBLS:

Summing, the following result is obtained:

Now, using the same TBL results, the sum is first calculated and then rounded according

to the same algorithm:

Rounding yields:

The second result is preferred. The following code sequence illustrates how addition of a

series of table interpolations can be performed without loss of precision in the intermediate

Freescale Semiconductor, Inc.

0010 0000 . 0111 0000

0011 1111 . 0111 0000

0000 0001 . 0111 0000

0110 0001 . 0101 0000

Long addition avoids problems with carry

Move radix point

Fraction MSB in carry

MC68340 USER'S MANUAL

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