ATtiny40 Atmel Corporation, ATtiny40 Datasheet - Page 33
ATtiny40
Manufacturer Part Number
ATtiny40
Description
Manufacturer
Atmel Corporation
Specifications of ATtiny40
Flash (kbytes)
4 Kbytes
Pin Count
20
Max. Operating Frequency
12 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
Yes
Max I/o Pins
18
Ext Interrupts
18
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
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
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
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
4
Input Capture Channels
1
Pwm Channels
2
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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8.2.2
8263A–AVR–08/10
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 High before Initial Time-out
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
RST
t
TOUT
TOUT
– has expired.
RST
– on its
168)
Fig-
33
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