ATMEGA168PA-PU Atmel, ATMEGA168PA-PU Datasheet - Page 49

MCU, 8BIT, AVR, 16K FLASH, 28PDIP

ATMEGA168PA-PU

Manufacturer Part Number
ATMEGA168PA-PU
Description
MCU, 8BIT, AVR, 16K FLASH, 28PDIP
Manufacturer
Atmel
Datasheet

Specifications of ATMEGA168PA-PU

Controller Family/series
Atmega
No. Of I/o's
23
Eeprom Memory Size
512Byte
Ram Memory Size
1KB
Cpu Speed
20MHz
No.
RoHS Compliant
Core Size
8bit
Program Memory Size
16KB
Oscillator Type
External, Internal
Rohs Compliant
Yes

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA168PA-PU
Manufacturer:
TI
Quantity:
1 240
10.4
10.5
8271C–AVR–08/10
External Reset
Brown-out Detection
Figure 10-3. 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 10-4. External Reset During Operation
ATmega48A/48PA/88A/88PA/168A/168PA/328/328P has an On-chip Brown-out Detection
(BOD) circuit for monitoring the V
The trigger level 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 interpreted as V
enabled, and V
the Brown-out Reset is immediately activated. When V
(V
t
The BOD circuit will only detect a drop in V
ger than t
TOUT
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
BOT+
INTERNAL
TIME-OUT
has expired.
in
RESET
RESET
BOD
Figure 10-5 on page
V
CC
CC
given in
CC
decreases to a value below the trigger level (V
”System and Reset Characteristics” on page
BOT+
V
”System and Reset Characteristics” on page
POT
50), the delay counter starts the MCU after the Time-out period
= V
CC
BOT
level during operation by comparing it to a fixed trigger level.
+ V
HYST
CC
Table 27-7 on page
if the voltage stays below the trigger level for lon-
V
/2 and V
RST
t
TOUT
BOT-
TOUT
CC
= V
increases above the trigger level
– has expired. The External Reset
BOT
BOT-
298.
RST
323.
- V
in
– on its positive edge, the
HYST
Figure 10-5 on page
323) will generate a
/2.When the BOD is
50),
49

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