MC68HC711xxxx Motorola, MC68HC711xxxx Datasheet - Page 185

• Manufacturer Part Number: MC68HC711xxxx
• Description: Microcontrollers
• Manufacturer: Motorola

10.16 MC68L11E9/E20 Expansion Bus Timing Characteristics
M68HC11E Family — Rev. 5
MOTOROLA
Num
1. V
2. Input clocks with duty cycles other than 50% affect bus performance. Timing parameters affected by input clock duty cycle
Where:
4a
4b
12
17
18
19
21
22
24
25
26
27
28
29
35
36
1
2
3
9
otherwise noted
are identified by (a) and (b). To recalculate the approximate bus timing values, substitute the following expressions in place
of 1/8 t
(a) (1–dc) × 1/4 t
(b) dc × 1/4 t
dc is the decimal value of duty cycle percentage (high time).
DD
Frequency of operation (E-clock frequency)
Cycle time
Pulse width, E low, PW
Pulse width, E high, PW
E and AS rise time
E and AS fall time
Address hold time
Non-multiplexed address valid time to E rise
Read data setup time
Read data hold time , max = t
Write data delay time, t
Write data hold time, t
Multiplexed address valid time to E rise
Multiplexed address valid time to AS fall
Multiplexed address hold time, t
Delay time, E to AS rise, t
Pulse width, AS high, PW
Delay time, AS to E rise, t
MPU address access time
MPU access time, t
Multiplexed address delay (Previous cycle MPU read)
= 3.0 Vdc to 5.5 Vdc, V
t
t
t
t
t
AV
AVM
ASL
ACCA
MAD
CYC
= PW
= PW
= PW
in the above formulas, where applicable:
= t
= t
CYC
ASD
CYC
EL
ASH
EL
CYC
–(t
+ 30 ns
–(PW
–(t
ASD
–70 ns
ASD
(2) (2)a
ACCE
EL
+ 80 ns)
(2)a
DHW
+ 90 ns)
–t
EL
DDW
SS
Characteristic
EH
, t
AVM
= PW
ASH
ASD
ASED
= 1/2 t
AH
(3)a
= 1/8 t
= 0 Vdc, T
= 1/2 t
= 1/8 t
) –t
= 1/8 t
(2)a
MAD
= 1/4 t
= 1/8 t
(2)a
EH
= 1/8 t
DSR
AHL
CYC
CYC
CYC
–t
CYC
–t
CYC
DSR
= 1/8 t
–25 ns
CYC
CYC
f
–30 ns
A
–30 ns
CYC
+ 70 ns
(1)
–30 ns
= T
–30 ns
–5 ns
–5 ns
CYC
L
Electrical Characteristics
(2)a
to T
(2)a
(2)a
–30 ns
(2)b
H
, all timing is shown with respect to 20% V
(2)b
MC68L11E9/E20 Expansion Bus Timing Characteristics
Symbol
PW
PW
PW
t
t
t
t
t
t
t
t
t
t
t
ACCA
ACCE
t
ASED
t
DDW
DHW
CYC
DSR
DHR
MAD
t
AVM
ASD
t
ASL
AHL
AH
f
AV
t
t
o
ASH
r
f
EH
EL
1000
Min
475
470
275
268
150
120
220
120
735
150
dc
—
—
95
30
—
95
95
—
0
1.0 MHz
Max
150
195
440
1.0
25
25
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Electrical Characteristics
DD
and 70% V
Min
500
225
220
298
dc
33
88
30
33
78
25
33
58
95
58
88
—
—
—
—
0
2.0 MHz
Max
133
190
DD
2.0
25
25
88
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Data Sheet
, unless
MHz
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
185