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 93/112:

External Data Memory Timing

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External Data Memory Timing

Table 37. External Data Memory Characteristics, 4.0V - 6.0V, No Wait State
Symbol
Parameter
0
1/t
Oscillator Frequency
CLCL
1
t
ALE Pulse Width
LHLL
2
t
Address Valid A to ALE Low
AVLL
Address Hold after ALE Low,
3a
t
LLAX_ST
ST/STD/STS Instructions
Address Hold after ALE Low,
3b
t
LLAX_LD
LD/LDD/LDS Instructions
4
t
Address Valid C to ALE Low
AVLLC
5
t
Address Valid to RD Low
AVRL
6
t
Address Valid to WR Low
AVWL
7
t
ALE Low to WR Low
LLWL
8
t
ALE Low to RD Low
LLRL
9
t
Data Setup to RD High
DVRH
10
t
Read Low to Data Valid
RLDV
11
t
Data Hold after RD High
RHDX
12
t
RD Pulse Width
RLRH
13
t
Data Setup to WR Low
DVWL
14
t
Data Hold after WR High
WHDX
15
t
Data Valid to WR High
DVWH
16
t
WR Pulse Width
WLWH
Table 38. External Data Memory Characteristics, 4.0V - 6.0V, One Cycle Wait State
Symbol
Parameter
0
1/t
Oscillator Frequency
CLCL
10
t
Read Low to Data Valid
RLDV
12
t
RD Pulse Width
RLRH
15
t
Data Valid to WR High
DVWH
16
t
WR Pulse Width
WLWH
Notes:
1. This assumes 50% clock duty cycle. The half-period is actually the high time of the external clock, XTAL1.
2. This assumes 50% clock duty cycle. The half-period is actually the low time of the external clock, XTAL1.
0841G–09/01
8 MHz Oscillator
Min
Max
Min
0.0
32.5
0.5 t
CLCL
22.5
0.5 t
CLCL
67.5
0.5 t
CLCL
15.0
15.0
22.5
0.5 t
CLCL
95.0
1.0 t
CLCL
157.5
1.5 t
CLCL
105.0
145.0
1.0 t
CLCL
42.5
82.5
0.5 t
CLCL
60.0
60.0
70.0
0.0
0.0
105.0
1.0 t
CLCL
27.5
0.5 t
CLCL
0.0
0.0
95.0
1.0 t
CLCL
42.5
0.5 t
CLCL
8 MHz Oscillator
Min
Max
Min
0.0
195.0
230.0
2.0 t
CLCL
220.0
2.0 t
CLCL
167.5
1.5 t
CLCL
AT90S8515
Variable Oscillator
Max
Unit
8.0
MHz
(1)
- 30.0
ns
(1)
- 40.0
ns
(2)
+ 5.0
ns
ns
(1)
- 40.0
ns
- 30.0
ns
(1)
- 30.0
ns
- 20.0
1.0 t
+ 20.0
ns
CLCL
(2)
(2)
- 20.0
0.5 t
+ 20.0
ns
CLCL
ns
1.0 t
- 55.0
ns
CLCL
ns
- 20.0
ns
(2)
- 35.0
ns
ns
- 30.0
ns
(1)
- 20.0
ns
Variable Oscillator
Max
Unit
8.0
MHz
2.0 t
- 55.0
ns
CLCL
- 20.0
ns
- 30.0
ns
(2)
- 20.0
ns
93

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