Motorola M68000 Betriebsanweisung PDF herunterladen (Seite 83)

Conditional and Arithmetic Instructions 69

20. Can MOVEQ be used to load only the low-order byte of a data

Answers

1. The carry bit, C.

2. The overflow bit, V.

3. Yes, approximately plus or minus 32,768 bytes.

4. The zero bit, Z.

5. The negative bit, N.

6. The CMP instruction does not store the result in the destination

9. The carry, overflow, negative, zero, and extend bits.

10. No, only five out of the eight.

11. 55+27=82, which is within the range of an unsigned byte; the carry

bit will not be set. 150+110=260, which is larger than the range of an

unsigned byte; the carry bit will be set.

12. (—100) + (+50) —50. The overflow bit will not be set. (—100) +

(—50) = —150. The largest signed negative byte is —128. In this

case the overflow bit will be set.

13. ADD.L D0,D1

operand

CMP.L #100,DO

BEQ STOP

3 CMP.L LIMIT,DO

BHI BIGER

BVC

ADD.L DO,D1

BCC OK

15.

TST.L DO

BEQ ZERO

16.

MOVE.L NUM1,D0

CMP.L NUM2,D0

BEQ EQUAL

BLT LESS

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 255 256

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Motorola M68000 Betriebsanweisung Seite 83