ATmega168P Atmel Corporation, ATmega168P Datasheet - Page 51

no-image

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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
ATmega168PA-15AZ
Manufacturer:
VAC
Quantity:
120
Price:
Company:
CHD Technology Co.,Limited CHD Technology Co.,Limited
Part Number:
ATmega168PA-AU
Manufacturer:
MICROCHIP
Quantity:
250
Price:
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
ATmega168PA-MU
Manufacturer:
ATMEL
Quantity:
4 000
Price:
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
ATmega168PA-PU
Manufacturer:
TI
Quantity:
1 240
Price:
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
ATmega168PB-AU
Manufacturer:
ATMEL
Quantity:
1 000
Price:
11.8
11.8.1
11.8.2
8025M–AVR–6/11
Watchdog Timer
Features
Overview
ADC is used. To reduce power consumption in Power-down mode, the user can avoid the three
conditions above to ensure that the reference is turned off before entering Power-down mode.
ATmega48P/88P/168P has an Enhanced Watchdog Timer (WDT). The WDT is a timer counting
cycles of a separate on-chip 128 kHz oscillator. The WDT gives an interrupt or a system reset
when the counter reaches a given time-out value. In normal operation mode, it is required that
the system uses the WDR - Watchdog Timer Reset - instruction to restart the counter before the
time-out value is reached. If the system doesn't restart the counter, an interrupt or system reset
will be issued.
Figure 11-7. Watchdog Timer
In Interrupt mode, the WDT gives an interrupt when the timer expires. This interrupt can be used
to wake the device from sleep-modes, and also as a general system timer. One example is to
limit the maximum time allowed for certain operations, giving an interrupt when the operation
has run longer than expected. In System Reset mode, the WDT gives a reset when the timer
expires. This is typically used to prevent system hang-up in case of runaway code. The third
mode, Interrupt and System Reset mode, combines the other two modes by first giving an inter-
rupt and then switch to System Reset mode. This mode will for instance allow a safe shutdown
by saving critical parameters before a system reset.
The Watchdog always on (WDTON) fuse, if programmed, will force the Watchdog Timer to Sys-
tem Reset mode. With the fuse programmed the System Reset mode bit (WDE) and Interrupt
Clocked from separate On-chip Oscillator
3 Operating modes
Selectable Time-out period from 16ms to 8s
Possible Hardware fuse Watchdog always on (WDTON) for fail-safe mode
– Interrupt
– System Reset
– Interrupt and System Reset
WATCHDOG
RESET
OSCILLATOR
128kHz
WDIE
WDIF
WDE
ATmega48P/88P/168P
WDP0
WDP1
WDP2
WDP3
MCU RESET
INTERRUPT
51

Related parts for ATmega168P