XC912BC32CFU8 Motorola Semiconductor Products, XC912BC32CFU8 Datasheet - Page 353

• Manufacturer Part Number: XC912BC32CFU8
• Description: M68HC12B Family Data Sheet
• Manufacturer: Motorola Semiconductor Products

19.16 Multiplexed Expansion Bus Timing
M68HC12B Family — Rev. 8.0
MOTOROLA
Num
1. V
2. All timings are calculated for normal port drives.
3. Crystal input is required to be within 45% to 55% duty.
4. Reduced drive must be off to meet these timings.
5. Unequalled loading of pins will affect relative timing numbers.
6. This characteristic is affected by clock stretch.
7. Without TAG enabled
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
—
1
2
3
5
7
8
9
Add N × t
DD
Frequency of operation (E-clock frequency)
Cycle timet
Pulse width, E lowPW
Pulse width, E high
Address delay timet
Address valid time to ECLK riset
Multiplexed address hold timet
Address hold to data valid
Data hold to high impedancet
Read data setup time
Read data hold time
Write data delay time
Write data hold time
Write data setup time
Read/write delay timet
Read/write valid time to E riset
Read/write hold time
Low strobe
Low strobe
Low strobe
Address access time
Access time from E rise
DBE delay from ECLK rise
DBE valid timet
DBE hold time from ECLK fall
= 5.0 Vdc ± 10%, V
cyc
NOTE:
where N = 0, 1, 2, or 3, depending on the number of clock stretches.
(7)
(7)
(7)
cyc
delay timet
valid time to E riset
hold time
= 1/f
DBE
Characteristic
o
Use of the multiplexed expansion bus at 8 MHz is discouraged due to TAD delay
factors.
(6)
AD
= PW
SS
(6)
(6)
PW
EL
RWD
= t
= 0 Vdc, T
t
t
(6)
DSW
ACCA
= t
LSD
EH
EH
cyc
t
(6)
= t
ACCE
cyc
= t
/4 + delay
− t
= t
= PW
DHZ
t
cyc
= t
/2 + delay
DBED
MAH
RWV
cyc
DBED
cyc
(1), (2), (3), (4), (5)
AV
/4 + delay
cyc
LSV
= PW
/2 + delay
A
= t
/4 + delay
EH
= t
= T
= PW
= PW
− t
= t
AD
= PW
cyc
− t
AD
cyc
EH
L
− 20
to T
/4 + delay
DDW
EL
EL
/4 + delay
− t
− t
EL
− t
− t
DSR
Electrical Specifications
DSR
H
− t
, unless otherwise noted
AD
RWD
LSD
Delay
−18
−4
−2
27
18
18
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
8
Symbol
PW
PW
t
t
t
t
t
t
t
t
t
t
t
t
t
AHDS
t
t
ACCA
ACCE
DBED
t
DBEH
t
t
t
DHW
MAH
DDW
DSW
RWD
RWV
RWH
t
t
DSR
DHR
t
DHZ
LSD
LSH
DBE
LSV
cyc
AD
f
AV
o
Multiplexed Expansion Bus Timing
EH
EL
–6.2
31.2
11.8
Min
125
5.8
3.8
3.8
dc
59
59
13
30
25
25
25
–3
—
—
—
—
—
—
—
—
0
8 MHz
Electrical Specifications
Max
67.5
45.2
62.5
57.5
57.5
27.6
27.8
57.5
8.0
10
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Min
500
246
248
107
103
103
115
dc
94
20
25
20
83
20
20
–3
—
—
—
—
—
—
—
—
0
2 MHz
Max
152
132
165
143
143
323
223
133
8.0
10
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Data Sheet
MHz
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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