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AT90USB646 датащи(PDF) 33 Page - ATMEL Corporation

номер детали AT90USB646
подробное описание детали  8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  435 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 датащи(HTML) 33 Page - ATMEL Corporation

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33
7593D–AVR–07/06
AT90USB64/128
Figure 5-7.
External Data Memory Cycles with SRWn1 = 0 and SRWn0 = 1
(1)
Note:
1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or
SRW00 (lower sector).
The ALE pulse in period T5 is only present if the next instruction accesses the RAM (internal
or external).
Figure 5-8.
External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 0(1)
Note:
1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or
SRW00 (lower sector).
The ALE pulse in period T6 is only present if the next instruction accesses the RAM (internal
or external).
ALE
T1
T2
T3
WR
T5
A15:8
Address
Prev. addr.
DA7:0
Address
Data
Prev. data
XX
RD
DA7:0 (XMBK = 0)
Data
Prev. data
Address
Data
Prev. data
Address
DA7:0 (XMBK = 1)
System Clock (CLKCPU)
T4
ALE
T1
T2
T3
WR
T5
A15:8
Address
Prev. addr.
DA7:0
Address
Data
Prev. data
XX
RD
DA7:0 (XMBK = 0)
Data
Prev. data
Address
Data
Prev. data
Address
DA7:0 (XMBK = 1)
System Clock (CLKCPU)
T4



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