ATMEGA328P-AU Atmel, ATMEGA328P-AU Datasheet - Page 288

MCU AVR 32K FLASH 32TQFP

ATMEGA328P-AU

Manufacturer Part Number
ATMEGA328P-AU
Description
MCU AVR 32K FLASH 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar

Specifications of ATMEGA328P-AU

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
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
Processor Series
ATMEGA32x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
2 KB
Interface Type
2-Wire, SPI, USART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
23
Number Of Timers
3
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 8 Channel
Cpu Family
ATmega
Device Core
AVR
Device Core Size
8b
Frequency (max)
20MHz
Total Internal Ram Size
2KB
# I/os (max)
23
Number Of Timers - General Purpose
3
Operating Supply Voltage (typ)
2.5/3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
1.8V
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
32
Package Type
TQFP
Controller Family/series
AVR MEGA
No. Of I/o's
23
Eeprom Memory Size
1KB
Ram Memory Size
2KB
Cpu Speed
20MHz
Rohs Compliant
Yes
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVR
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ATMEGA328P-20AU
ATMEGA328P-20AU
Q3790246

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26.8.11
26.8.12
26.8.13
8271C–AVR–08/10
Preventing Flash Corruption
Programming Time for Flash when Using SPM
Simple Assembly Code Example for a Boot Loader
Table 26-5.
Note:
During periods of low V
too low for the CPU and the Flash to operate properly. These issues are the same as for board
level systems using the Flash, and the same design solutions should be applied.
A Flash program corruption can be caused by two situations when the voltage is too low. First, a
regular write sequence to the Flash requires a minimum voltage to operate correctly. Secondly,
the CPU itself can execute instructions incorrectly, if the supply voltage for executing instructions
is too low.
Flash corruption can easily be avoided by following these design recommendations (one is
sufficient):
1. If there is no need for a Boot Loader update in the system, program the Boot Loader Lock
2. Keep the AVR RESET active (low) during periods of insufficient power supply voltage.
3. Keep the AVR core in Power-down sleep mode during periods of low V
The calibrated RC Oscillator is used to time Flash accesses.
gramming time for Flash accesses from the CPU.
Table 26-6.
Note:
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
Signature Byte
Device Signature Byte 1
Device Signature Byte 2
Device Signature Byte 3
RC Oscillator Calibration Byte
Flash write (Page Erase, Page Write, and
write Lock bits by SPM)
bits to prevent any Boot Loader software updates.
This can be done by enabling the internal Brown-out Detector (BOD) if the operating volt-
age matches the detection level. If not, an external low V
used. If a reset occurs while a write operation is in progress, the write operation will be
completed provided that the power supply voltage is sufficient.
vent the CPU from attempting to decode and execute instructions, effectively protecting
the SPMCSR Register and thus the Flash from unintentional writes.
;-the routine writes one page of data from RAM to Flash
; the first data location in RAM is pointed to by the Y pointer
; the first data location in Flash is pointed to by the Z-pointer
;-error handling is not included
All other addresses are reserved for future use.
1. Minimum and maximum programming time is per individual operation.
Signature Row Addressing
SPM Programming Time
Symbol
CC
, the Flash program can be corrupted because the supply voltage is
(1)
Min. Programming Time
Z-Pointer Address
0x0000
0x0002
0x0004
0x0001
3.7 ms
CC
Table 26-6
reset protection circuit can be
Max Programming Time
shows the typical pro-
CC
. This will pre-
4.5 ms
288

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