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10-20 M68040 USER’S MANUAL MOTOROLA
10.6 INTEGER UNIT INSTRUCTION TIMINGS (Continued)
DIVS.W, DIVU.W*DIVS.L, DIVU.L,
DIVSL.L, DIVUL.L*JMP
Addressing
Mode
<ea>
Calculate Execute <ea>
Calculate Execute <ea>
Calculate Execute
Dn 8 27 9 44
An ——————
(An) 8 27 9 44 3 2L + 1
(An)+ 8 27 9 44
–(An) 8 27 9 44
(d 16,An) 8 27 11 2L + 44 4 3L + 1
(d 16,PC) 11 3L + 27 12 3L + 44 6 5L + 1
(xxx).W, (xxx).L 8 27 11 2L + 44 3 2L + 1
#<xxx> 8 27 10 1L + 44
(d 8,An,Xn) 11 30 12 47 6 6
(d 8,PC,Xn) 12 1L + 30 13 1L + 47 7 1L + 6
(BR,Xn) 13 1L + 31 14 1L + 48 8 1L + 7
(bd,BR,Xn) 14 1L + 32 15 1L + 49 9 1L + 8
([bd,BR,Xn]) 17 1L + 35 18 1L + 52 12 1L + 11
([bd,BR,Xn],od) 18 1L + 36 19 1L + 53 12 1L + 11
([bd,BR],Xn) 18 3L + 34 19 3L + 51 13 3L + 10
([bd,BR],Xn,od) 19 3L + 35 20 3L + 52 14 3L + 11
*This instruction interlocks the <ea> calculate and execute stages. Execution time for a DIV/0 exception taken and
exception processing is approximately 16 + <ea> calculate clocks. For example, DIV.W #0,Dn takes approximately
24 clocks in both the <ea> calculate and execute times to execute the divide instruction, perform exception stacking,
fetch the exception vector, and prefetch the next instruction.
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