ATmega168A Atmel Corporation, ATmega168A Datasheet - Page 50

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ATmega168A

Manufacturer Part Number
ATmega168A
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega168A

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
No
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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11.4
11.5
8271D–AVR–05/11
External Reset
Brown-out Detection
Figure 11-3. MCU Start-up, RESET Extended Externally
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset.
When the applied signal reaches the Reset Threshold Voltage – V
delay counter starts the MCU after the Time-out period – t
can be disabled by the RSTDISBL fuse, see
Figure 11-4. External Reset During Operation
ATmega48A/PA/88A/PA/168A/PA/328/P has an On-chip Brown-out Detection (BOD) circuit for
monitoring the V
for the BOD can be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to
ensure spike free Brown-out Detection. The hysteresis on the detection level should be inter-
preted as V
decreases to a value below the trigger level (V
Reset is immediately activated. When V
5 on page
The BOD circuit will only detect a drop in V
ger than t
INTERNAL
TIME-OUT
RESET
RESET
BOD
V
51), the delay counter starts the MCU after the Time-out period t
CC
CC
BOT+
given in
= V
CC
level during operation by comparing it to a fixed trigger level. The trigger level
BOT
ATmega48A/PA/88A/PA/168A/PA/328/P
”System and Reset Characteristics” on page
+ V
HYST
V
”System and Reset Characteristics” on page
POT
/2 and V
BOT-
CC
increases above the trigger level (V
CC
= V
Table 28-7 on page
if the voltage stays below the trigger level for lon-
V
BOT
BOT-
RST
t
- V
TOUT
in
HYST
Figure 11-5 on page
TOUT
/2.When the BOD is enabled, and V
– has expired. The External Reset
299.
RST
324.
– on its positive edge, the
TOUT
324) will generate a
51), the Brown-out
BOT+
has expired.
in
Figure 11-
50
CC

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