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AT90USB646 Datasheet(PDF) 411 Page - ATMEL Corporation

Part # AT90USB646
Description  Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  434 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 411 Page - ATMEL Corporation

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7593A–AVR–02/06
AT90USB64/128
Figure 30-7. External Memory Timing (SRWn1 = 0, SRWn0 = 0
Table 30-13. External Data Memory Characteristics, 2.7 - 5.5 Volts, SRWn1 = 1, SRWn0 = 1
Symbol
Parameter
4 MHz Oscillator
Variable Oscillator
Unit
Min
Max
Min
Max
01/t
CLCL
Oscillator Frequency
0.0
8
MHz
10
tRLDV
Read Low to Data Valid
690
3.0tCLCL-60
ns
12
t
RLRH
RD Pulse Width
735
3.0t
CLCL-15
ns
14
t
WHDX
Data Hold After WR High
485
2.0t
CLCL-15
ns
15
tDVWH
Data Valid to WR High
750
3.0tCLCL
ns
16
t
WLWH
WR Pulse Width
735
3.0t
CLCL-15
ns
ALE
T1
T2
T3
WR
T4
A15:8
Address
Prev. addr.
DA7:0
Address
Data
Prev. data
XX
RD
DA7:0 (XMBK = 0)
Data
Address
System Clock (CLKCPU)
1
4
2
7
6
3a
3b
5
8
12
16
13
10
11
14
15
9



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