ATMEGA328P-20PU Atmel, ATMEGA328P-20PU Datasheet - Page 34

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ATMEGA328P-20PU

Manufacturer Part Number
ATMEGA328P-20PU
Description
Manufacturer
Atmel
Datasheet

Specifications of ATMEGA328P-20PU

Cpu Family
ATmega
Device Core
AVR
Device Core Size
8b
Frequency (max)
20MHz
Interface Type
SPI/TWI/USART
Program Memory Type
Flash
Program Memory Size
32KB
Total Internal Ram Size
2KB
# I/os (max)
23
Number Of Timers - General Purpose
3
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
6-chx10-bit
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Through Hole
Pin Count
28
Package Type
PDIP
Lead Free Status / Rohs Status
Compliant
8.7
8.8
8025K–AVR–10/09
128 kHz Internal Oscillator
External Clock
The 128 kHz internal Oscillator is a low power Oscillator providing a clock of 128 kHz. The fre-
quency is nominal at 3V and 25°C. This clock may be select as the system clock by
programming the CKSEL Fuses to “11” as shown in
Table 8-13.
Note:
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 8-14.
Note:
To drive the device from an external clock source, XTAL1 should be driven as shown in
8-4 on page
to “0000” (see
Table 8-15.
Figure 8-4.
BOD enabled
Fast rising power
Slowly rising power
Power Conditions
8-14.
1. Note that the 128 kHz oscillator is a very low power clock source, and is not designed for a
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to
high accuracy.
14CK + 4.1 ms to ensure programming mode can be entered.
34. To run the device on an external clock, the CKSEL Fuses must be programmed
128 kHz Internal Oscillator Operating Modes
Start-up Times for the 128 kHz Internal Oscillator
Table
Crystal Oscillator Clock Frequency
External Clock Drive Configuration
Nominal Frequency
8-15).
Frequency
0 - 20 MHz
EXTERNAL
128 kHz
SIGNAL
CLOCK
Start-up Time from Power-
down and Power-save
NC
(1)
Reserved
6 CK
6 CK
6 CK
Table
ATmega48P/88P/168P
XTAL2
XTAL1
GND
8-13.
Additional Delay from
14CK + 64 ms
14CK + 4 ms
14CK
Reset
CKSEL3..0
CKSEL3..0
(1)
0011
0000
SUT1..0
Figure
00
01
10
11
34

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