ATTINY261-20MUR Atmel, ATTINY261-20MUR Datasheet - Page 171
ATTINY261-20MUR
Manufacturer Part Number
ATTINY261-20MUR
Description
IC MCU AVR 2K FLASH 20MHZ 32QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY261-20MUR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VFQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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18.2
2588E–AVR–08/10
Fuse Bytes
The ATtiny261/461/861 have three fuse bytes.
briefly the functionality of all the fuses and how they are mapped into the fuse bytes. Note that
the fuses are read as logical zero, “0”, if they are programmed.
Table 18-3.
Notes:
Table 18-4.
Notes:
SELFPRGEN
Fuse High Byte
RSTDISBL
DWEN
SPIEN
WDTON
EESAVE
BODLEVEL2
BODLEVEL1
BODLEVEL0
Fuse High Byte
(3))
1. Enables SPM instruction. See
(2)
1. See
2. DWEN must be unprogrammed when Lock Bit security is required.
3. The SPIEN Fuse is not accessible in SPI programming mode.
4. Programming this fues will disable the Watchdog Timer Interrupt. See
5. See
(4)
Fuses. After programming the RSTDISBL fuse, parallel programming must be used to change
fuses and allow further programming.
Memory Lock Bits” on page 170.
Timer Control Register” on page 47
(1)
(5)
(5)
(5)
(1)
Fuse Extended Byte
Fuse High Byte
“Alternate Functions of Port B” on page 66
Table 19-6 on page 191
Bit No
Bit No
7
6
5
4
3
2
1
0
7
6
6
4
3
2
1
0
Description
-
-
-
-
-
-
-
Self-Programming Enable
Description
External Reset disable
DebugWIRE Enable
Enable Serial Program and Data
Downloading
Watchdog Timer always on
EEPROM memory is preserved
through the Chip Erase
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
for BODLEVEL Fuse decoding.
“Self-Programming the Flash” on page
for details.
Table
18-3,
for description of RSTDISBL and DWEN
Table 18-4
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
Default Value
1 (unprogrammed)
1 (unprogrammed)
0 (programmed, SPI prog.
enabled)
1 (unprogrammed)
1 (unprogrammed, EEPROM
not preserved)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
and
See “Program And Data
165.
“WDTCR – Watchdog
Table 18-5
describe
171
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