ATtiny461A Atmel Corporation, ATtiny461A Datasheet - Page 74

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ATtiny461A

Manufacturer Part Number
ATtiny461A
Description
Manufacturer
Atmel Corporation
Datasheets

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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11.5
74
Input Capture Unit
ATtiny261A/461A/861A
internal clock source, selected by the Clock Select bits (CS0[2:0]). When no clock source is
selected (CS0[2:0] = 0) the timer is stopped. However, the TCNT0 value can be accessed by the
CPU, regardless of whether clk
counter clear or count operations. The Timer/Counter Overflow Flag (TOV0) is set when the
counter reaches the maximum value and it can be used for generating a CPU interrupt.
The Timer/Counter incorporates an Input Capture unit that can capture external events and give
them a time-stamp indicating time of occurrence. The external signal indicating an event, or mul-
tiple events, can be applied via the ICP0 pin or alternatively, via the analog-comparator unit. The
time-stamps can then be used to calculate frequency, duty-cycle, and other features of the sig-
nal applied. Alternatively the time-stamps can be used for creating a log of the events.
The Input Capture unit is illustrated by the block diagram shown in
the block diagram that are not directly a part of the Input Capture unit are gray shaded.
Figure 11-4.
The Output Compare Register OCR0A is a dual-purpose register that is also used as an 8-bit
Input Capture Register ICR0. In 16-bit Input Capture mode the Output Compare Register
OCR0B serves as the high byte of the Input Capture Register ICR0. In 8-bit Input Capture mode
the Output Compare Register OCR0B is free to be used as a normal Output Compare Register,
but in 16-bit Input Capture mode the Output Compare Unit cannot be used as there are no free
Output Compare Register(s). Even though the Input Capture register is called ICR0 in this sec-
tion, it is refering to the Output Compare Register(s).
When a change of the logic level (an event) occurs on the Input Capture pin (ICP0), alternatively
on the Analog Comparator output (ACO), and this change confirms to the setting of the edge
detector, a capture will be triggered. When a capture is triggered, the value of the counter
(TCNT0) is written to the Input Capture Register (ICR0). The Input Capture Flag (ICF0) is set at
ICP0
WRITE
OCR0B (8-bit)
TEMP (8-bit)
Comparator
Input Capture Unit Block Diagram
Analog
ICR0 (16-bit Register)
ACO*
OCR0A (8-bit)
T0
is present or not. A CPU write overrides (has priority over) all
ACIC0*
DATA BUS
Canceler
Noise
ICNC0
(8-bit)
TCNT0H (8-bit)
TCNT0 (16-bit Counter)
Detector
ICES0
Figure
Edge
11-4. The elements of
TCNT0L (8-bit)
ICF0 (Int.Req.)
8197C–AVR–05/11

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