ATMEGA88P-20AUR Atmel, ATMEGA88P-20AUR Datasheet - Page 49
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ATMEGA88P-20AUR
Manufacturer Part Number
ATMEGA88P-20AUR
Description
MCU AVR 8KB FLASH 20MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA168P-20AU.pdf
(420 pages)
Specifications of ATMEGA88P-20AUR
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
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Part Number
Manufacturer
Quantity
Price
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10.4
10.5
8025L–AVR–7/10
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
ATmega48P/88P/168P has an On-chip Brown-out Detection (BOD) circuit for monitoring the
V
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
V
value below the trigger level (V
ately activated. When V
the delay counter starts the MCU after the Time-out period t
The BOD circuit will only detect a drop in V
ger than t
CC
BOT
level during operation by comparing it to a fixed trigger level. The trigger level for the BOD
INTERNAL
TIME-OUT
+ V
RESET
RESET
HYST
BOD
V
CC
CC
/2 and V
given in
BOT-
”System and Reset Characteristics” on page
CC
= V
increases above the trigger level (V
V
”System and Reset Characteristics” on page
POT
BOT
BOT-
- V
in
HYST
Figure 10-5 on page
/2.When the BOD is enabled, and V
CC
Table 27-6 on page
if the voltage stays below the trigger level for lon-
V
RST
t
TOUT
ATmega48P/88P/168P
TOUT
50), the Brown-out Reset is immedi-
TOUT
– has expired. The External Reset
BOT+
has expired.
293.
RST
314.
in
– on its positive edge, the
Figure 10-5 on page
314) will generate a
CC
decreases to a
BOT+
50),
49
=
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