ATtiny461A Atmel Corporation, ATtiny461A Datasheet - Page 42
ATtiny461A
Manufacturer Part Number
ATtiny461A
Description
Manufacturer
Atmel Corporation
Specifications of ATtiny461A
Flash (kbytes)
4 Kbytes
Pin Count
20
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
8
Hardware Qtouch Acquisition
No
Max I/o Pins
16
Ext Interrupts
16
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
0.25
Eeprom (bytes)
256
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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8.2.2
8.2.3
42
ATtiny261A/461A/861A
External Reset
Brown-out Detection
An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses longer
than the minimum pulse width (see
ate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a
reset. When the applied signal reaches the Reset Threshold Voltage – V
edge, the delay counter starts the MCU after the Time-out period – t
Figure 8-4.
A Brown-out Detection (BOD) circuit monitors the V
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
When the BOD is enabled, and V
8-5), the Brown-out Reset is immediately activated. When V
(V
expired.
The BOD circuit will only detect a drop in V
ger than t
Figure 8-5.
BOT+
in
BOD
Figure
CC
given in
INTERNAL
TIME-OUT
External Reset During Operation
Brown-out Reset During Operation
8-5), the delay counter starts the MCU after the Time-out period t
RESET
RESET
V
CC
“System and Reset Characteristics” on page
CC
“System and Reset Characteristics” on page
decreases to a value below the trigger level (V
V
BOT-
BOT+
CC
= V
if the voltage stays below the trigger level for lon-
BOT
CC
+ V
level during operation by comparing it to a
HYST
CC
/2 and V
V
t
TOUT
BOT+
increases above the trigger level
188.
TOUT
BOT-
– has expired.
= V
RST
BOT
– on its positive
188) will gener-
- V
8197C–AVR–05/11
BOT-
HYST
TOUT
in
/2.
Figure
has
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