ATTINY9-MAHR Atmel, ATTINY9-MAHR Datasheet - Page 28

• Manufacturer Part Number: ATTINY9-MAHR
• Description: IC MCU AVR 1K FLASH 8UDFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY9-MAHR

• Package / Case: 8-UDFN Exposed Pad
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 12MHz
• Number Of I /o: 4
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 32 x 8
• Program Memory Size: 1KB (1K x 8)
• Oscillator Type: Internal
• Peripherals: POR, PWM, WDT
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

8.2.1
8.2.2
28
ATtiny4/5/9/10
Power-on Reset
V
CC
Level Monitoring
A Power-on Reset (POR) pulse is generated by an on-chip detection circuit. The detection level
is defined in section
whenever V
Reset, as 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.
ATtiny4/5/9/10 have a V
V
VCC Level Monitoring Control and Status register” on page
The VLM circuit provides a status flag, VLMF, that indicates if voltage on the V
selected trigger level. The flag can be read from VLMCSR, but it is also possible to have an
interrupt generated when the VLMF status flag is set. This interrupt is enabled by the VLMIE bit
in the VLMCSR register. The flag can be cleared by changing the trigger level or by writing it to
zero. The flag is automatically cleared when the voltage at V
trigger level.
TIME-OUT
INTERNAL
TIME-OUT
INTERNAL
CC
CC
RESET
RESET
RESET
decreases below the detection level.
RESET
pin against fixed trigger levels. The trigger levels are set with VLM2:0 bits, see
V
V
CC
CC
CC
MCU Start-up, RESET Tied to V
MCU Start-up, RESET Extended Externally
is below the detection level. The POR circuit can be used to trigger the Start-up
“System and Reset Characteristics” on page
CC
V
V
POT
POT
Level Monitoring (VLM) circuit that compares the voltage level at the
CC
> t
t
TOUT
rise. The reset signal is activated again, without any delay, when
V
TOUT
RST
V
CC
RST
t
TOUT
34.
CC
rises back above the selected
120. The POR is activated
CC
pin is below the
8127D–AVR–02/10
“VLMCSR –