ATMEGA128A-MNR Atmel, ATMEGA128A-MNR Datasheet - Page 302
ATMEGA128A-MNR
Manufacturer Part Number
ATMEGA128A-MNR
Description
IC MCU AVR 128K FLASH 64VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA128A-MNR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP
Core
AVR8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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26.6.11
26.6.12
8151H–AVR–02/11
Programming the Lock Bits
Reading the Fuse and Lock Bits
Figure 26-5. Programming the Fuses
The algorithm for programming the Lock bits is as follows (refer to
page 297
The Lock bits can only be cleared by executing Chip Erase.
The algorithm for reading the Fuse and Lock bits is as follows (refer to
on page 297
1. A: Load Command “0010 0000”.
2. C: Load Data Low Byte. Bit n = “0” programs the Lock bit.
3. Give WR a negative pulse and wait for RDY/BSY to go high.
1. A: Load Command “0000 0100”.
2. Set OE to “0”, BS2 to “0”, and BS1 to “0”. The status of the Fuse Low bits can now be
3. Set OE to “0”, BS2 to “1”, and BS1 to “1”. The status of the Fuse High bits can now be
4. Set OE to “0”, BS2 to “1”, and BS1 to “0”. The status of the Extended Fuse bits can now
5. Set OE to “0”, BS2 to “0”, and BS1 to “1”. The status of the Lock bits can now be read at
6. Set OE to “1”.
RESET +12V
read at DATA (“0” means programmed).
read at DATA (“0” means programmed).
be read at DATA (“0” means programmed).
DATA (“0” means programmed).
RDY/BSY
PAGEL
XTAL1
DATA
BS2
XA1
XA0
BS1
for details on Command and Data loading):
WR
OE
for details on Command loading):
$40
A
DATA
C
Write Fuse Low byte
XX
$40
A
DATA
C
Write Fuse high byte
XX
“Programming the Flash” on
$40
A
ATmega128A
“Programming the Flash”
DATA
C
Write Extended Fuse byte
XX
302
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