ATTINY861-15MZ Atmel, ATTINY861-15MZ Datasheet - Page 73

• Manufacturer Part Number: ATTINY861-15MZ
• Description: MCU AVR 8K FLASH 15MHZ 32-QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY861-15MZ

• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 16
• Eeprom Size: 512 x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Program Memory Size: 8KB (8K x 8)
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: USI
• Core Size: 8-Bit
• Processor Series: ATTINY8x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRMC320
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 11 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

14.2.2
14.3
14.4
2588B–AVR–11/06
Timer/Counter Clock Sources
Counter Unit
Definitions
Many register and bit references in this section are written in general form. A lower case “n”
replaces the Timer/Counter number, in this case 0. A lower case “x” replaces the Output Com-
pare Unit, in this case Compare Unit A or Compare Unit B. However, when using the register or
bit defines in a program, the precise form must be used, i.e., TCNT0L for accessing
Timer/Counter0 counter value and so on.
The definitions in
Table 14-1.
The Timer/Counter can be clocked internally, via the prescaler, or by an external clock source on
the T0 pin. The Clock Select logic is controlled by the Clock Select (CS02:0) bits located in the
Timer/Counter Control Register 0 B (TCCR0B), and controls which clock source and edge the
Timer/Counter uses to increment its value. The Timer/Counter is inactive when no clock source
is selected. The output from the Clock Select logic is referred to as the timer clock (clk
details on clock sources and prescaler, see
The main part of the 8-bit Timer/Counter is the programmable bi-directional counter unit.
14-3
Table 14-2.
Signal description (internal signals):
The counter is incremented at each timer clock (clk
restarts from BOTTOM. The counting sequence is determined by the setting of the WGM00 bits
located in the Timer/Counter Control Register (TCCR0A). For more details about counting
sequences, see
BOTTOM
MAX
TOP
shows a block diagram of the counter and its surroundings.
count
clk
top
Tn
The counter reaches the BOTTOM when it becomes 0.
The counter reaches its MAXimum when it becomes 0xFF (decimal 255) in 8-bit mode or
0xFFFF (decimal 65535) in 16-bit mode.
The counter reaches the TOP when it becomes equal to the highest value in the count
sequence. The TOP value can be assigned to be the fixed value 0xFF/0xFFFF (MAX) or
the value stored in the OCR0A Register.
DATA BUS
Definitions
Counter Unit Block Diagram
”Modes of Operation” on page
TCNTn
Table 14-1
are also used extensively throughout the document.
Increment or decrement TCNT0 by 1.
Timer/Counter clock, referred to as clk
Signalize that TCNT0 has reached maximum value.
count
Control Logic
”Timer/Counter0 Prescaler” on page
74. clk
top
T0
TOVn
(Int.Req.)
clk
T0
) until it passes its TOP value and then
Tn
can be generated from an external or
ATtiny261/461/861
Clock Select
( From Prescaler )
Detector
Edge
T0
in the following.
69.
Tn
T0
Figure
). For
73