ATTINY861-15MZ Atmel, ATTINY861-15MZ Datasheet - Page 28

• 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

7.6
28
Calibrated Internal RC Oscillator
ATtiny261/461/861
By default, the Internal RC Oscillator provides an approximate 8.0 MHz clock. Though voltage
and temperature dependent, this clock can be very accurately calibrated by the user. See
23-1 on page 188
shipped with the CKDIV8 Fuse programmed. See
more details.
This clock may be selected as the system clock by programming the CKSEL Fuses as shown in
Table 7-6 on page
hardware loads the pre-programmed calibration value into the OSCCAL Register and thereby
automatically calibrates the RC Oscillator. The accuracy of this calibration is shown as Factory
calibration in
By changing the OSCCAL register from SW, see
page
The accuracy of this calibration is shown as User calibration in
When this Oscillator is used as the chip clock, the Watchdog Oscillator will still be used for the
Watchdog Timer and for the Reset Time-out. For more information on the pre-programmed cali-
bration value, see the section
Table 7-6.
Notes:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 7-7 on page
Table 7-7.
Note:
SUT1..0
10
00
01
11
32, it is possible to get a higher calibration accuracy than by using the factory calibration.
(1)
1. The device is shipped with this option selected.
2. The frequency ranges are preliminary values. Actual values are TBD.
3. If 8 MHz frequency exceeds the specification of the device (depends on V
1. The device is shipped with this option selected.
Fuse can be programmed in order to divide the internal frequency by 8.
Table 23-1 on page
Internal Calibrated RC Oscillator Operating Modes
Start-up Times for the Internal Calibrated RC Oscillator Clock Selection
Frequency Range
from Power-down
and
28.
28. If selected, it will operate with no external components. During reset,
Start-up Time
”Internal Oscillator Speed” on page 211
6 CK
6 CK
6 CK
7.3 - 8.1
”Calibration Byte” on page
188.
(2)
(MHz)
Additional Delay from
Reset (V
Reserved
”OSCCAL – Oscillator Calibration Register” on
14CK + 64 ms
14CK + 4 ms
”System Clock Prescaler” on page 31
14CK
CC
170.
= 5.0V)
Table 23-1 on page
for more details. The device is
(1)(3)
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
CKSEL3..0
0010
CC
), the CKDIV8
2588B–AVR–11/06
188.
Table
for