ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 340

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

340
ATmega64(L)
Figure 161. External Memory Timing (SRWn1 = 1, SRWn0 = 0)
Figure 162. External Memory Timing (SRWn1 = 1, SRWn0 = 1)
Note:
System Clock (CLK
System Clock (CLK
DA7:0 (XMBK = 0)
DA7:0 (XMBK = 0)
1. The ALE pulse in the last period (T4-T7) is only present if the next instruction
A15:8
DA7:0
CPU
DA7:0
ALE
A15:8
WR
RD
CPU
ALE
WR
accesses the RAM (internal or external).
RD
)
)
Prev. addr.
Prev. data
Prev. addr.
Prev. data
T1
T1
1
Address
Address
4
2
1
5
T2
6
Address
Address
3a
3b
4
2
XX
7
5
8
T2
6
13
3a
3b
XX
10
7
8
13
T3
10
T3
Data
Address
12
Data
16
15
T4
9
Data
Address
12
Data
16
15
T4
9
T5
11
T5
(1)
T6
11
2490G–AVR–03/04
14
T6
T7
14