ATtiny4 Atmel Corporation, ATtiny4 Datasheet - Page 63
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ATtiny4
Manufacturer Part Number
ATtiny4
Description
Manufacturer
Atmel Corporation
Specifications of ATtiny4
Flash (kbytes)
0.5 Kbytes
Pin Count
6
Max. Operating Frequency
12 MHz
Cpu
8-bit AVR
# Of Touch Channels
1
Hardware Qtouch Acquisition
No
Max I/o Pins
4
Ext Interrupts
4
Usb Speed
No
Usb Interface
No
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
0.03
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 125
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
1
Output Compare Channels
2
Input Capture Channels
1
Pwm Channels
2
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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11.7.1
11.8
11.8.1
11.8.2
8127E–AVR–11/11
Modes of Operation
Compare Output Mode and Waveform Generation
Normal Mode
Clear Timer on Compare Match (CTC) Mode
The Waveform Generator uses the COM0x1:0 bits differently in normal, CTC, and PWM modes.
For all modes, setting the COM0x1:0 = 0 tells the Waveform Generator that no action on the
OC0x Register is to be performed on the next compare match. For compare output actions in the
non-PWM modes refer to
page
page
A change of the COM0x1:0 bits state will have effect at the first compare match after the bits are
written. For non-PWM modes, the action can be forced to have immediate effect by using the 0x
strobe bits.
The mode of operation, i.e., the behavior of the Timer/Counter and the Output Compare pins, is
defined by the combination of the Waveform Generation mode (WGM03:0) and Compare Output
mode (COM0x1:0) bits. The Compare Output mode bits do not affect the counting sequence,
while the Waveform Generation mode bits do. The COM0x1:0 bits control whether the PWM out-
put generated should be inverted or not (inverted or non-inverted PWM). For non-PWM modes
the COM0x1:0 bits control whether the output should be set, cleared or toggle at a compare
match
For detailed timing information refer to
The simplest mode of operation is the Normal mode (WGM03:0 = 0). In this mode the counting
direction is always up (incrementing), and no counter clear is performed. The counter simply
overruns when it passes its maximum 16-bit value (MAX = 0xFFFF) and then restarts from the
BOTTOM (0x0000). In normal operation the Timer/Counter Overflow Flag (TOV0) will be set in
the same timer clock cycle as the TCNT0 becomes zero. The TOV0 flag in this case behaves
like a 17th bit, except that it is only set, not cleared. However, combined with the timer overflow
interrupt that automatically clears the TOV0 flag, the timer resolution can be increased by soft-
ware. There are no special cases to consider in the Normal mode, a new counter value can be
written anytime.
The Input Capture unit is easy to use in Normal mode. However, observe that the maximum
interval between the external events must not exceed the resolution of the counter. If the interval
between events are too long, the timer overflow interrupt or the prescaler must be used to
extend the resolution for the capture unit.
The Output Compare units can be used to generate interrupts at some given time. Using the
Output Compare to generate waveforms in Normal mode is not recommended, since this will
occupy too much of the CPU time.
In Clear Timer on Compare or CTC mode (WGM03:0 = 4 or 12), the OCR0A or ICR0 Register
are used to manipulate the counter resolution. In CTC mode the counter is cleared to zero when
the counter value (TCNT0) matches either the OCR0A (WGM03:0 = 4) or the ICR0 (WGM03:0 =
12). The OCR0A or ICR0 define the top value for the counter, hence also its resolution. This
mode allows greater control of the compare match output frequency. It also simplifies the opera-
tion of counting external events.
75.
75, and for phase correct and phase and frequency correct PWM refer to
(“Compare Match Output Unit” on page
Table 11-2 on page
“Timer/Counter Timing Diagrams” on page
62)
75. For fast PWM mode refer to
ATtiny4/5/9/10
Table 11-3 on
Table 11-4 on
70.
63