ATTINY861A-SUR Atmel, ATTINY861A-SUR Datasheet - Page 89
ATTINY861A-SUR
Manufacturer Part Number
ATTINY861A-SUR
Description
MCU AVR 8KB FLASH 20MHZ 20SOIC
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY461A-MU.pdf
(292 pages)
Specifications of ATTINY861A-SUR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
16
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATTINY861A-SUR
Manufacturer:
Atmel
Quantity:
950
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12.2.5
8197B–AVR–01/10
Definitions
back right after writing the register. The read back values are delayed for the Timer/Counter1
(TCNT1) register, Timer/Counter1 High Byte Register (TC1H) and flags (OCF1A, OCF1B,
OCF1D and TOV1), because of the input and output synchronization.
The system clock frequency must be lower than half of the PCK frequency, because the syn-
chronization mechanism of the asynchronous Timer/Counter1 needs at least two edges of the
PCK when the system clock is high. If the frequency of the system clock is too high, it is a risk
that data or control values are lost.
Figure 12-2. Timer/Counter1 Synchronization Register Block Diagram.
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, B, C or D. However, when using the register or bit
defines in a program, the precise form must be used, i.e., TCNT1 for accessing Timer/Counter1
PCKE
CK
PCK
SYNC
MODE
ASYNC
MODE
IO-registers
OCR1B
OCF1A
OCR1A
OCR1C
OCR1D
TCCR1A
TCCR1B
TCCR1C
TCCR1D
TCNT1
TC1H
OCF1B
OCF1D
TOV1
~1/2 CK Delay
1/2 CK Delay
S
A
Input synchronization
registers
OCR1A_SI
OCR1B_SI
OCR1C_SI
OCR1D_SI
TCCR1A_SI
TCCR1B_SI
TCCR1C_SI
TCCR1D_SI
TCNT1_SI
TC1H_SI
OCF1A_SI
OCF1B_SI
OCF1D_SI
TOV1_SI
1 PCK Delay
1 CK Delay
S
A
8-BIT DATABUS
Timer/Counter1
TCNT1
1 CK Delay
1 PCK Delay
Output synchronization
registers
TCNT1_SO
TC1H_SO
OCF1A_SO
OCF1B_SO
OCF1D_SO
TOV1_SO
1/2 CK Delay
~1 CK Delay
TCNT1
TC1H
OCF1A
OCF1B
OCF1D
TOV1
89
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