atmega161-4pi ATMEL Corporation, atmega161-4pi Datasheet - Page 136

• Manufacturer Part Number: atmega161-4pi
• Description: 8-bit Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

136
ATmega161(L)
Figure 83. External Memory Timing (SRWn1 = 0, SRWn0 = 0)
Figure 84. External Memory Timing (SRWn1 = 0, SRWn0 = 1)
Data/Address [7..0]
Data/Address [7..0]
Data/Address [7..0]
Data/Address [7..0]
System Clock Ø
Address [15..8]
System Clock Ø
Address [15..8]
ALE
WR
RD
ALE
WR
RD
Prev. data
Prev. data
Prev. addr.
Prev. data
Prev. data
Prev. addr.
T1
XX
XX
XX
T1
1
XX
XX
XX
Address
Address
4
2
1
T2
6
5
3a
Address
3b
Address
4
2
7
8
13
T2
6
5
10
3a
3b
Address
Data
7
8
13
Data
T3
10
16
15
Address
Data
15
16
Data
12
T3
12
9
9
T4
11
14
11
T4
14
1228D–AVR–02/07
T5
XX
XX
XX
XX
XX
XX