ATMEGA161L-4PC Atmel, ATMEGA161L-4PC Datasheet - Page 123
ATMEGA161L-4PC
Manufacturer Part Number
ATMEGA161L-4PC
Description
IC AVR MCU 16K LV 4MHZ COM 40DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA161-8AC.pdf
(159 pages)
Specifications of ATMEGA161L-4PC
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
Connectivity
SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
35
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
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Reading the Flash
Reading the EEPROM
Programming the Fuse Bits
Programming the Lock Bits
1228D–AVR–02/07
The algorithm for reading the Flash memory is as follows (refer to “Programming the
Flash” on page 120 for details on command and address loading):
1. A: Load Command “0000 0010”.
2. H: Load Address High Byte ($00 - $1F)
3. B: Load Address Low Byte ($00 - $FF)
4. Set OE to “0”, and BS1 to “0”. The Flash word Low byte can now be read at
5. Set BS to “1”. The Flash word High byte can now be read at DATA.
6. Set OE to “1”.
The algorithm for reading the EEPROM memory is as follows (refer to “Programming the
Flash” on page 120 for details on command and address loading):
1. A: Load Command “0000 0011”.
2. H: Load Address High Byte ($00 - $01)
3. B: Load Address ($00 - $FF)
4. Set OE to “0”, and BS1 to “0”. The EEPROM Data byte can now be read at
5. Set OE to “1”.
The algorithm for programming the Fuse bits is as follows (refer to “Programming the
Flash” on page 120 for details on command and data loading):
1. A: Load Command “0100 0000”.
2. C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
3. Give WR a negative pulse and wait for RDY/BSY to go high.
The algorithm for programming the Lock bits is as follows (refer to “Programming the
Flash” on page 120 for details on command and data loading):
1. A: Load Command “0010 0000”.
2. D: Load Data Low Byte. Bit n = “0” programs the Lock bit.
3. L: Write Data Low Byte.
The Lock bits can only be cleared by executing Chip Erase.
DATA.
DATA.
Bit 6 = BOOTRST Fuse bit
Bit 5 = SPIEN Fuse bit
Bit 4 = SUT Fuse bit
Bit 3 = “1”. This bit is reserved and must be left unprogrammed (“1”).
Bits 2 - 0 = CKSEL2..0 Fuse bits
Bit 7 = “1”. This bit is reserved and should be left unprogrammed (“1”).
Bit 5 = Boot Lock Bit12
Bit 4 = Boot Lock Bit11
Bit 3 = Boot Lock Bit02
Bit 2 = Boot Lock Bit01
Bit 1 = Lock Bit2
Bit 0 = Lock Bit1
Bits 7 - 6 = “1”. These bits are reserved and should be left unprogrammed (“1”).
ATmega161(L)
123
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