MC68340 datasheet(166/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

5- 29

5.3.3.10 CONDITION TESTS. Conditional program control instructions and the TRAPcc

instruction execute on the basis of condition tests. A condition test is the evaluation of a

logical expression related to the state of the CCR bits. If the result is 1, the condition is

true. If the result is 0, the condition is false. For example, the T condition is always true,

and the EQ condition is true only if the Z-bit condition code is true. Table 5-12 lists each

condition test.

Table 5-12. Condition Tests

Mnemonic

Condition

Encoding

Test

True

0000

False

0001

High

0010

• Z

Low or Same

0011

C + Z

Carry Clear

0100

Carry Set

0101

Not Equal

0110

Equal

0111

Overflow Clear

1000

Overflow Set

1001

Plus

1010

Minus

1011

Greater or Equal

1100

• V + N • V

Less Than

1101

• V + N • V

Greater Than

1110

• V • Z+ N • V • Z

Less or Equal

1111

Z + N

• V + N • V

* Not available for the Bcc instruction.

•

= Boolean AND

+ = Boolean OR

N = Boolean NOT

5.3.4 Using the TBL Instructions

There are four TBL instructions. TBLS returns a signed, rounded byte, word, or long-word

result. TBLSN returns a signed, unrounded byte, word, or long-word result. TBLU returns

an unsigned, rounded byte, word, or long-word result. TBLUN returns an unsigned,

unrounded byte, word, or long-word result. All four instructions support two types of

interpolation data: an n-element table stored in memory and a two-element range stored in

a pair of data registers. The latter form provides a means of performing surface (3D)

interpolation between two previously calculated linear interpolations.

The following examples show how to compress tables and use fewer interpolation levels

between table entries. Example 1 (see Figure 5-7) demonstrates TBL for a 257-entry

table, allowing up to 256 interpolation levels between entries. Example 2 (see Figure 5-8)

reduces table length for the same data to four entries. Example 3 (see Figure 5-9)

demonstrates use of an 8-bit independent variable with an instruction.

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