ATTINY43U-SUR Atmel, ATTINY43U-SUR Datasheet - Page 140

• Manufacturer Part Number: ATTINY43U-SUR
• Description: MCU AVR 4KB FLASH 8MHZ 20SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY43U-SUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

19.2
140
Fuse Bytes
ATtiny43U
The ATtiny43U has three Fuse bytes.
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 19-3.
Notes:
Table 19-4.
Notes:
SELFPRGEN
RSTDISBL
DWEN
SPIEN
WDTON
EESAVE
BODLEVEL2
BODLEVEL1
BODLEVEL0
Fuse High Byte
Fuse High Byte
(2)
(3)
1. Enables SPM instruction. See
1. See
2. DWEN must be unprogrammed when Lock Bit security is required. See
3. The SPIEN Fuse is not accessible in SPI Programming mode.
4. See
5. See
(4)
(1)
Fuses. When programming the RSTDISBL Fuse, TBD programming has to be used to change
fuses to perform further programming
Memory Lock Bits” on page
details.
(5)
(5)
(5)
(1)
Fuse Extended Byte
Fuse High Byte
“Alternate Functions of Port B” on page 74
“WDT Configuration as a Function of the Fuse Settings of WDTON” on page 52
Table 20-5 on page 158
Bit No
7
6
5
4
3
2
1
0
Bit No
7
6
5
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
139.
Table
for BODLEVEL Fuse decoding.
“Self-Programming the Flash” on page
19-3,
Table 19-4
for description of RSTDISBL and DWEN
and
Table 19-5
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)
133.
“Program And Data
briefly describe the
8048B–AVR–03/09
for