ATMEGA162V-1MC Atmel, ATMEGA162V-1MC Datasheet - Page 18
![IC MCU AVR 16K 1.8V 8MHZ 44-QFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
ATMEGA162V-1MC
Manufacturer Part Number
ATMEGA162V-1MC
Description
IC MCU AVR 16K 1.8V 8MHZ 44-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA162V-1MC
Core Processor
AVR
Core Size
8-Bit
Speed
1MHz
Connectivity
EBI/EMI, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, 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)
1.8 V ~ 3.6 V
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-VQFN Exposed Pad
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
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EEPROM Data Memory
EEPROM Read/Write Access
The EEPROM Address
Register – EEARH and EEARL
18
ATmega162(V/U/L)
The ATmega162 contains 512 bytes of data EEPROM memory. It is organized as a sep-
arate data space, in which single bytes can be read and written. The EEPROM has an
endurance of at least 100,000 write/erase cycles. The access between the EEPROM
and the CPU is described in the following, specifying the EEPROM Address Registers,
the EEPROM Data Register, and the EEPROM Control Register.
“Memory Programming” on page 228 contains a detailed description on EEPROM Pro-
gramming in SPI, JTAG, or Parallel Programming mode.
The EEPROM Access Registers are accessible in the I/O space.
The write access time for the EEPROM is given in Table 1. A selftiming function, how-
ever, lets the user software detect when the next byte can be written. If the user code
contains instructions that write the EEPROM, some precautions must be taken. In
heavily filtered power supplies, V
causes the device for some period of time to run at a voltage lower than specified as
minimum for the clock frequency used. See “Preventing EEPROM Corruption” on page
22. for details on how to avoid problems in these situations.
In order to prevent unintentional EEPROM writes, a specific write procedure must be fol-
lowed. Refer to the description of the EEPROM Control Register for details on this.
When the EEPROM is read, the CPU is halted for four clock cycles before the next
instruction is executed. When the EEPROM is written, the CPU is halted for two clock
cycles before the next instruction is executed.
• Bits 15..9 – Res: Reserved Bits
These bits are reserved bits in the ATmega162 and will always read as zero.
• Bits 8..0 – EEAR8..0: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address
in the 512 bytes EEPROM space. The EEPROM data bytes are addressed linearly
between 0 and 511. The initial value of EEAR is undefined. A proper value must be writ-
ten before the EEPROM may be accessed.
Bit
Read/Write
Initial Value
EEAR7
R/W
15
R
–
7
0
X
EEAR6
R/W
14
R
X
–
6
0
EEAR5
R/W
13
R
X
–
5
0
CC
is likely to rise or fall slowly on Power-up/down. This
EEAR4
R/W
12
R
–
4
0
X
EEAR3
R/W
11
R
X
–
3
0
EEAR2
R/W
10
–
2
R
0
X
EEAR1
R/W
R
9
–
1
0
X
EEAR8
EEAR0
R/W
R/W
X
X
8
0
2513C–AVR–09/02
EEARH
EEARL
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