ATMEGA161-8PI Atmel, ATMEGA161-8PI Datasheet - Page 137

• Manufacturer Part Number: ATMEGA161-8PI
• Description: IC AVR MCU 16K 8MHZ IND 40-DIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA161-8PI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Other names: ATMEGA1618PI

1228D–AVR–02/07
Figure 85. External Memory Timing (SRWn1 = 1, SRWn0 = 0)
Figure 86. External Memory Timing (SRWn1 = 1, SRWn0 = 1)
Note:
Data/Address [7..0]
Data/Address [7..0]
Data/Address [7..0]
Data/Address [7..0]
System Clock Ø
System Clock Ø
Address [15..8]
Address [15..8]
1. The ALE pulse in the last period (T4 - T7) is only present if the next instruction
ALE
WR
RD
ALE
WR
RD
accesses the RAM (internal or external). The data and address will only change in T4
- T7 if ALE is present (the next instruction accesses the RAM).
Prev. data
Prev. data
Prev. addr.
Prev. data
Prev. data
Prev. addr.
T1
T1
XX
XX
XX
XX
XX
XX
1
Address
Address
4
2
1
T2
6
Address
5
Address
4
2
3a
3b
7
8
T2
6
5
13
3a
3b
10
7
8
Address
Data
13
Data
T3
10
Address
Data
Data
T3
16
12
T4
15
9
15
16
12
T4
9
T5
ATmega161(L)
(1)
11
T5
T6
14
11
14
T6
T7
XX
XX
XX
XX
XX
XX
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