ATTINY20-MMHR Atmel, ATTINY20-MMHR Datasheet - Page 32

• Manufacturer Part Number: ATTINY20-MMHR
• Description: MCU AVR 2KB FLASH 12MHZ 20QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY20-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: 12
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 1.8 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
• Eeprom Size: -

8.2.3
8.2.4
32
ATtiny20
Watchdog Reset
Brown-out Detection
Figure 8-4.
When the Watchdog times out, it will generate a short reset pulse. On the falling edge of this
pulse, the delay timer starts counting the time-out period t
ation of the Watchdog Timer and
Figure 8-5.
ATtiny20 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
has expired.
BOT-
CC
CC
BOD
= V
33), 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
Table 20-4 on page 175
decreases to a value below the trigger level (V
CK
CC
if the voltage stays below the trigger level for lon-
TOUT
for details on reset time-out.
. See
175.
page 32
CC
BOT+
increases above the
for details on oper-
= V
CC
8235B–AVR–04/11
BOT
BOT-
level during
+ V
in
Figure
HYST
/2