MC68EC020FG25 Freescale Semiconductor, MC68EC020FG25 Datasheet - Page 230

• Manufacturer Part Number: MC68EC020FG25
• Description: IC MPU 32 BIT 25MHZ 100-QFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC020FG25

• Processor Type: M680x0 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

8.2.3 Calculate Effective Address
The calculate immediate effective address table indicates the number of clock periods
needed for the processor to calculate the specified effective address. Fetch time is only
included for the first level of indirection on memory indirect addressing modes. The total
number of clock cycles is outside the parentheses; the number of read, prefetch, and write
cycles is given inside the parentheses as (r/p/w). These cycles are included in the total
clock cycle number.
B = Base address; 0, An, PC, Xn, An + Xn. Form does not affect timing.
I
NOTE: Xn cannot be in B and I at the same time. Scaling and size of Xn do not affect timing.
8-16
Dn
An
(An)
(An)+
–(An)
(d 16 ,An) or (d 16 ,PC)
<data >.W
<data >.L
(d
(d
(B)
(d
(d
([B],I)
([B],I,d
([B],I,d
([d
([d
([d
([d
([d
([d
8
16
16
32
16
16
16
32
32
32
= Index; 0, Xn
,An,Xn) or (d
,An,Xn) or (d
,B)
,B)
,B],I)
,B],I,d
,B],I,d
,B],I)
,B],I,d
,B],I,d
16
32
)
)
16
32
16
32
)
)
)
)
8
,PC,Xn)
16
,PC,Xn)
Address Mode
M68020 USER’S MANUAL
Best Case
10(1/0/0)
10(1/0/0)
10(1/0/0)
12(1/0/0)
12(1/0/0)
14(1/0/0)
16(1/0/0)
16(1/0/0)
0(0/0/0)
0(0/0/0)
2(0/0/0)
2(0/0/0)
2(0/0/0)
2(0/0/0)
2(0/0/0)
1(0/0/0)
1(0/0/0)
3(0/0/0)
3(0/0/0)
5(0/0/0)
9(0/0/0)
8(1/0/0)
Cache Case
12(0/0/0)
11(1/0/0)
13(1/0/0)
13(1/0/0)
13(1/0/0)
15(1/0/0)
15(1/0/0)
17(1/0/0)
19(1/0/0)
19(1/0/0)
0(0/0/0)
0(0/0/0)
2(0/0/0)
2(0/0/0)
2(0/0/0)
2(0/0/0)
2(0/0/0)
4(0/0/0)
4(0/0/0)
6(0/0/0)
6(0/0/0)
8(0/0/0)
Worst Case
MOTOROLA
10(0/1/0)
15(0/2/0)
12(1/1/0)
15(1/1/0)
16(1/2/0)
15(1/1/0)
18(1/2/0)
19(1/2/0)
19(1/2/0)
21(1/2/0)
24(1/3/0)
0(0/0/0)
0(0/0/0)
2(0/0/0)
2(0/0/0)
2(0/0/0)
3(0/1/0)
3(0/1/0)
5(0/1/0)
5(0/1/0)
7(0/1/0)
7(0/1/0)