ATTINY40-MMHR Atmel, ATTINY40-MMHR Datasheet - Page 34
ATTINY40-MMHR
Manufacturer Part Number
ATTINY40-MMHR
Description
MCU AVR 4KB FLASH 12MHZ 3X3 QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY40-MMHR.pdf
(216 pages)
Specifications of ATTINY40-MMHR
Core Processor
AVR
Core Size
8-Bit
Speed
12MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
18
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Manufacturer
Quantity
Price
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8.2.3
8.2.4
34
ATtiny40
Watchdog Reset
Brown-out Detection
Figure 8-4.
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the time-out period t
34
reset time-out.
Figure 8-5.
ATtiny40 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
operation by comparing it to a fixed trigger level. 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
and V
When the BOD is enabled, and V
8-6 on page
trigger level (V
t
The BOD circuit will only detect a drop in V
ger than t
TOUT
for details on operation of the Watchdog Timer and
has expired.
BOT-
CC
CC
BOD
= V
35), the Brown-out Reset is immediately activated. When V
given in
BOT
External Reset During Operation
Watchdog Reset During Operation
BOT+
- V
in
HYST
“System and Reset Characteristics” on page
Figure
/2.
8-6), the delay counter starts the MCU after the Time-out period
CC
decreases to a value below the trigger level (V
CK
CC
if the voltage stays below the trigger level for lon-
Table 21-4 on page 168
168.
CC
BOT+
increases above the
= V
TOUT
CC
8263A–AVR–08/10
for details on
BOT
BOT-
level during
. See
+ V
in
Figure
HYST
page
/2
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