AT90S8515

Manufacturer Part NumberAT90S8515
Description8-bit microcontroller with 8K bytes in-system programmable flash, 2.7-6.0V
ManufacturerATMEL Corporation
AT90S8515 datasheet
 
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Page 92/112:

External Clock Drive Waveforms

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External Clock Drive
Waveforms
AT90S8515
92
Figure 67. External Clock
VIH1
VIL1
Table 36. External Clock Drive
Symbol
Parameter
1/t
Oscillator Frequency
CLCL
t
Clock Period
CLCL
t
High Time
CHCX
t
Low Time
CLCX
t
Rise Time
CLCH
t
Fall Time
CHCL
Note:
See “External Data Memory Timing” for a description of how the duty cycle influences the
timing for the external data memory.
Figure 68. External RAM Timing
T1
0
System Clock Ø
ALE
4
Address [15..8]
Prev. Address
Data/Address [7..0]
Prev. Address
3a
WR
Data/Address [7..0]
Prev. Address
Address
RD
Note: Clock cycle T3 is only present when external SRAM wait state is enabled.
V
= 2.7V to 4.0V
V
= 4.0V to 6.0V
CC
CC
Min
Max
Min
0
4.0
0
250.0
125.0
100.0
50.0
100.0
50.0
1.6
1.6
T2
T3
1
7
Address
2
13
Address
Data
16
6
3b
Data
5
10
9
8
Max
Units
8.0
MHz
ns
ns
ns
0.5
µs
0.5
µs
T4
15
Addr.
14
11
Addr.
12
0841G–09/01