ATTINY20-MMHR Atmel, ATTINY20-MMHR Datasheet - Page 31

• 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: -

8.2.2
8235B–AVR–04/11
External Reset
device is kept in reset after V
V
Figure 8-2.
Figure 8-3.
An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses longer
than the minimum pulse width (see section
will generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to gen-
erate a reset. When the applied signal reaches the Reset Threshold Voltage – V
positive edge, the delay counter starts the MCU after the time-out period – t
External reset is ignored during Power-on start-up count. After Power-on reset the internal reset
is extended only if RESET pin is low when the initial Power-on delay count is complete. See
ure 8-2
CC
TIME-OUT
INTERNAL
TIME-OUT
INTERNAL
decreases below the detection level.
RESET
RESET
RESET
RESET
V
V
CC
CC
and
Figure
MCU Start-up, RESET Tied to V
MCU Start-up, RESET Extended Externally
8-3.
V
V
POT
POT
CC
> t
t
TOUT
rise. The reset signal is activated again, without any delay, when
V
TOUT
RST
“System and Reset Characteristics” on page
V
CC
RST
t
TOUT
TOUT
ATtiny20
– has expired.
RST
– on its
175)
Fig-
31