ATMEGA168-20PI Atmel, ATMEGA168-20PI Datasheet - Page 308
![IC AVR MCU 16K 20MHZ 28DIP](/photos/7/21/72189/453-28-dip_sml.jpg)
ATMEGA168-20PI
Manufacturer Part Number
ATMEGA168-20PI
Description
IC AVR MCU 16K 20MHZ 28DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA168-20PI
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
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)
2.7 V ~ 5.5 V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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28.7
308
3. C
4. f
5. This requirement applies to all ATmega48/88/168 2-wire Serial Interface operation. Other devices connected to the 2-wire
SPI Timing Characteristics
ATmega48/88/168
Serial Bus need only obey the general f
CK
b
= capacitance of one bus line in pF.
= CPU clock frequency
Figure 28-4. 2-wire Serial Bus Timing
See
Table 28-6.
Note:
SCL
SDA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Figure 28-5
t
SU;STA
Description
SCK period
SCK high/low
Rise/Fall time
Setup
Hold
Out to SCK
SCK to out
SCK to out high
SS low to out
SCK period
SCK high/low
Rise/Fall time
Setup
Hold
SCK to out
SCK to SS high
SS high to tri-state
SS low to SCK
1. In SPI Programming mode the minimum SCK high/low period is:
- 2 t
- 3 t
SPI Timing Parameters
CLCL
CLCL
and
for f
for f
(1)
SCL
Figure 28-6
CK
CK
requirement.
t
HD;STA
< 12 MHz
> 12 MHz
t
t
of
LOW
Master
Master
Master
Master
Master
Master
Master
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Mode
Master
Slave
Slave
for details.
t
HIGH
t
HD;DAT
Min
4 • t
2 • t
10
t
20
20
ck
ck
ck
t
LOW
t
SU;DAT
Typ
See
50% duty cycle
3.6
10
10
0.5 • t
10
10
15
15
10
Table 18-5
sck
Max
1600
t
SU;STO
t
r
2545S–AVR–07/10
t
BUF
ns
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