ATMEGA163L-4PC Atmel, ATMEGA163L-4PC Datasheet - Page 64
ATMEGA163L-4PC
Manufacturer Part Number
ATMEGA163L-4PC
Description
IC AVR MCU 16K A/D 2.7V 40DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA163-8AC.pdf
(187 pages)
Specifications of ATMEGA163L-4PC
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
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
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Preventing EEPROM
Corruption
64
ATmega163(L)
The user should poll the EEWE bit before starting the read operation. If a write operation
is in progress, it is not possible to set the EERE bit, nor to change the EEAR Register.
The calibrated Oscillator is used to time the EEPROM accesses. Table 24 lists the typi-
cal programming time for EEPROM access from the CPU
Table 24. EEPROM Programming Time.
During periods of low V
age is too low for the CPU and the EEPROM to operate properly. These issues are the
same as for board level systems using the EEPROM, and the same design solutions
should be applied.
An EEPROM data corruption can be caused by two situations when the voltage is too
low. First, a regular write sequence to the EEPROM requires a minimum voltage to
operate correctly. Secondly, the CPU itself can execute instructions incorrectly, if the
supply voltage for executing instructions is too low.
EEPROM data corruption can easily be avoided by following these design recommen-
dations (one is sufficient):
1. Keep the AVR RESET active (low) during periods of insufficient power supply
2. Keep the AVR core in Power-down Sleep Mode during periods of low V
3. Store constants in Flash memory if the ability to change memory contents from
EEPROM write
(from CPU)
voltage. This can be done by enabling the internal Brown-out Detector (BOD) if
the operating voltage matches the detection level. If not, an external low V
Reset Protection circuit can be used. If a Reset occurs while a write operation is
in progress, the write operation will be completed provided that the power supply
is voltage is sufficient.
will prevent the CPU from attempting to decode and execute instructions, effec-
tively protecting the EEPROM Registers from unintentional writes.
software is not required. Flash memory can not be updated by the CPU unless
the boot loader software supports writing to the Flash and the Boot Lock bits are
configured so that writing to the Flash memory from CPU is allowed. See “Boot
Loader Support” on page 134 for details.
Symbol
Number of Calibrated
RC Oscillator Cycles
CC,
the EEPROM data can be corrupted because the supply volt-
2048
Min Programmingn
1.9 ms
Time
Max Programming
3.8 ms
Time
1142E–AVR–02/03
CC
. This
CC
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