ATTINY44A-MMHR Atmel, ATTINY44A-MMHR Datasheet - Page 39
ATTINY44A-MMHR
Manufacturer Part Number
ATTINY44A-MMHR
Description
MCU AVR 4KB FLASH 20MHZ 20QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY44A-MMHR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
12
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 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
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8.2
8.2.1
8183C–AVR–03/11
Reset Sources
Power-on Reset
The ATtiny24A/44A/84A has four sources of reset:
A Power-on Reset (POR) pulse is generated by an on-chip detection circuit. The detection level
is defined in
V
well as to detect a failure in supply voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
device is kept in reset after V
V
Figure 8-2.
Figure 8-3.
CC
CC
• Power-on Reset. The MCU is reset when the supply voltage is below the Power-on Reset
• External Reset. The MCU is reset when a low level is present on the RESET pin for longer
• Watchdog Reset. The MCU is reset when the Watchdog Timer period expires and the
• Brown-out Reset. The MCU is reset when the supply voltage V
threshold (V
than the minimum pulse length when RESET function is enabled
Watchdog is enabled
Reset threshold (V
is below the detection level. The POR circuit can be used to trigger the Start-up Reset, as
decreases below the detection level.
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
RESET
RESET
RESET
RESET
V
V
CC
CC
“System and Reset Characteristics” on page
POT
MCU Start-up, RESET Tied to V
MCU Start-up, RESET Extended Externally
)
BOT
) and the Brown-out Detector is enabled
V
V
V
CC
POT
POT
RST
rise. The reset signal is activated again, without any delay, when
t
TOUT
V
RST
CC
t
TOUT
176. The POR is activated whenever
ATtiny24A/44A/84A
CC
is below the Brown-out
39
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