ATmega168P Atmel Corporation, ATmega168P Datasheet - Page 275

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ATmega168P

Manufacturer Part Number
ATmega168P
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega168P

Flash (kbytes)
16 Kbytes
Pin Count
32
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes

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27. Boot Loader Support – Read-While-Write Self-Programming, ATmega88P and
27.1
27.2
27.3
27.3.1
27.3.2
8025M–AVR–6/11
ATmega168P
Features
Overview
Application and Boot Loader Flash Sections
Application Section
BLS – Boot Loader Section
Note:
In ATmega88P and ATmega168P, the Boot Loader Support provides a real Read-While-Write
Self-Programming mechanism for downloading and uploading program code by the MCU itself.
This feature allows flexible application software updates controlled by the MCU using a Flash-
resident Boot Loader program. The Boot Loader program can use any available data interface
and associated protocol to read code and write (program) that code into the Flash memory, or
read the code from the program memory. The program code within the Boot Loader section has
the capability to write into the entire Flash, including the Boot Loader memory. The Boot Loader
can thus even modify itself, and it can also erase itself from the code if the feature is not needed
anymore. The size of the Boot Loader memory is configurable with fuses and the Boot Loader
has two separate sets of Boot Lock bits which can be set independently. This gives the user a
unique flexibility to select different levels of protection.
The Flash memory is organized in two main sections, the Application section and the Boot
Loader section (see
BOOTSZ Fuses as shown in
have different level of protection since they have different sets of Lock bits.
The Application section is the section of the Flash that is used for storing the application code.
The protection level for the Application section can be selected by the application Boot Lock bits
(Boot Lock bits 0), see
Boot Loader code since the SPM instruction is disabled when executed from the Application
section.
While the Application section is used for storing the application code, the The Boot Loader soft-
ware must be located in the BLS since the SPM instruction can initiate a programming when
executing from the BLS only. The SPM instruction can access the entire Flash, including the
BLS itself. The protection level for the Boot Loader section can be selected by the Boot Loader
Lock bits (Boot Lock bits 1), see
Read-While-Write Self-Programming
Flexible Boot Memory Size
High Security (Separate Boot Lock Bits for a Flexible Protection)
Separate Fuse to Select Reset Vector
Optimized Page
Code Efficient Algorithm
Efficient Read-Modify-Write Support
1. A page is a section in the Flash consisting of several bytes (see
during programming. The page organization does not affect normal operation.
(1)
Size
Figure
Table 27-2 on page
Table 27-7 on page 287
27-2). The size of the different sections is configured by the
Table 27-3 on page
279. The Application section can never store any
279.
ATmega48P/88P/168P
and
Figure
27-2. These two sections can
Table 28-9 on page
295) used
275

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