参数资料
型号: MC68L11D0FNE2
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 40/138页
文件大小: 1047K
代理商: MC68L11D0FNE2
MC68L11D0
MC68HC711D3 Data Sheet, Rev. 2.1
134
Freescale Semiconductor
B.2.5 Expansion Bus Timing
Num
Characteristic(1)
1. VDD = 3.0 Vdc to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH. All timing is shown with respect to 20% VDD and 70% VDD, unless
otherwise noted.
Symbol
1.0 MHz
2.0 MHz
Unit
Min
Max
Min
Max
Frequency of operation (E-clock frequency)
fO
dc
1.0
dc
2.0
MHz
1
Cycle time
tcyc
1000
500
ns
2
Pulse width, E low, PWEL = 1/2 tcyc — 23 ns
PWEL
475
225
ns
3
Pulse width, E high, PWEH = 1/2 tcyc – 28 ns
PWEH
470
220
ns
4A
E and AS rise time
tr
—25
25
ns
4B
E and AS fall time
tf
—25
25
ns
9
Address hold time(2)a, tAH = 1/8 tcyc – 29.5 ns
2. Input clocks with duty cycles other than 50% affect bus performance. Timing parameters affected by input clock duty cycle
are identified by (a) and (b). To recalculate the approximate bus timing values, substitute the following expressions in place
of 1/8 tCYC in the above formulas, where applicable:
(a) (1-dc)
× 1/4 tCYC
(b) dc
× 1/4 tCYC
Where:
DC is the decimal value of duty cycle percentage (high time).
tAH
95
33
ns
12
Non-muxed address valid time to E rise
tAV = PWEL – (tASD + 80 ns)
(2)a
tAV
275
88
ns
17
Read data setup time
tDSR
30
30
ns
18
Read data hold time (max = tMAD)tDHR
0
150
0
88
ns
19
Write data delay time, tDDW = 1/8 tcyc + 65.5 ns
(2)a
tDDW
195
133
ns
21
Write data hold time, tDHW = 1/8 tcyc – 29.5 ns
(2)a
tDHW
95
33
ns
22
Muxed address valid time to E rise
tAVM = PWEL – (tASD + 90 ns)
(2)a
tAVM
265
78
ns
24
Muxed address valid time to AS fall
tASL = PWASH – 70 ns
tASL
150
25
ns
25
Muxed address hold time, tAHL = 1/8 tcyc – 29.5 ns
(2)b
tAHL
95
33
ns
26
Delay time, E to AS rise, tASD = 1/8 tcyc – 9.5 ns
(2)a
tASD
120
58
ns
27
Pulse width, AS high, PWASH = 1/4 tcyc – 29 ns
PWASH
220
95
ns
28
Delay time, AS to E rise, tASED = 1/8 tcyc – 9.5 ns
(2)b
tASED
120
58
ns
29
MPU address access time(2)a
tACCA = tcyc – (PWEL– tAVM) – tDSR – tf
tACCA
735
298
ns
35
MPU access time , tACCE = PWEH – tDSR
tACCE
440
190
ns
36
Muxed address delay (previous cycle MPU read)
tMAD = tASD + 30 ns
(2)a
tMAD
150
88
ns
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