ATTINY48-MMHR Atmel, ATTINY48-MMHR Datasheet - Page 188

• Manufacturer Part Number: ATTINY48-MMHR
• Description: MCU AVR 4KB FLASH 12MHZ 28QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY48-MMHR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 24
• 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 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

20. Lock Bits, Fuse Bits and Device Signature
20.1
188
Lock Bits
ATtiny48/88
ATtiny48/88 provide the program and data memory lock bits listed in
Table 20-1.
Notes:
Lock bits can be left unprogrammed (“1”) or can be programmed (“0”) to obtain the additional
features listed in
Table 20-2.
Notes:
Lock bits can be erased to “1” with the Chip Erase command, only.
The ATtiny48/88 has no separate Boot Loader section. The SPM instruction is enabled for the
whole Flash if the SELFPRGEN fuse is programmed (“0”), otherwise it is disabled.
LB2
LB1
LB Mode
Lock Bit Byte
1
2
3
1. “1” means unprogrammed, “0” means programmed.
1. Program the Fuse bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
Memory Lock Bits
Lock Bit Byte
Lock Bit Protection Modes
Table
LB2
1
1
0
20-2.
LB1
1
0
0
Bit No
7
6
5
4
3
2
1
0
Protection Type
No memory lock features enabled.
Further programming of Flash and EEPROM is disabled in
parallel and serial programming mode. Fuse bits are locked in
both serial and parallel programming mode
Further reading and programming of Flash and EEPROM is
disabled in parallel and serial programming mode. Fuse bits are
locked in both serial and parallel programming mode
(1)(2)
Description
–
–
–
–
–
–
Lock bit
Lock bit
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
Table
20-1.
(1)
(1)
8008G–AVR–04/11
(1)