ATMEGA8HVD-4MX Atmel, ATMEGA8HVD-4MX Datasheet - Page 129

• Manufacturer Part Number: ATMEGA8HVD-4MX
• Description: MCU AVR 8K FLASH 2.1-8V 4MHZ QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8HVD-4MX

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 5
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 2.4 V
• Data Converters: A/D 1x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 18-MLF® Exposed Pad (Staggered Leads), DFN
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Connectivity: -

24. Memory Programming
24.1
24.2
24.2.1
8052B–AVR–09/08
Program And Data Memory Lock Bits
Fuse Bits
High Byte
The ATmega4HVD/8HVD provides two Lock bits which can be left unprogrammed (“1”) or can
be programmed (“0”) to obtain the additional features listed in
only be erased to “1” with the Chip Erase command.
Table 24-1.
Note:
Table 24-2.
Notes:
The ATmega4HVD/8HVD has two Fuse bytes.
functionality of all the fuses and how they are mapped into the Fuse byte. Note that the fuses
are read as logical zero, “0”, if they are programmed.
Table 24-3.
Lock Bit Byte
LB2
LB1
Bit No
LB Mode
7:2
1
0
1
2
3
1. “1” means unprogrammed, “0” means programmed
1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
Memory Lock Bits
Fuse High Byte
OSCSEL1
OSCSEL0
Lock Bit Byte
Lock Bit Protection Modes
Fuse High Byte
LB2
–
1
1
0
Bit No
(1)
LB1
1
0
0
7
6
5
4
3
2
1
0
Protection Type
No memory lock features enabled.
The Fuse bits are locked and further programming of the Flash
and EEPROM is disabled programming mode.
The Fuse bits are locked and further programming and
verification of the Flash and EEPROM is disabled
programming mode.
Oscillator Select 1
Oscillator Select 0
Description
(1)(2)
Description
–
Lock bit
Lock bit
Table 24-4
–
–
–
–
–
–
(1)
ATmega4HVD/8HVD
and
Table 24-3
Table
Default Value
1 (unprogrammed)
1 (unprogrammed)
0 (programmed)
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
24-2. The Lock bits can
describe briefly the
(1)
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