参数资料
型号: ATMEGA103-6AI
厂商: Atmel
文件页数: 97/141页
文件大小: 0K
描述: IC MCU 128K 6MHZ A/D IT 64TQFP
产品培训模块: megaAVR Introduction
标准包装: 90
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 6MHz
连通性: SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 128KB(64K x 16)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 4K x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-TQFP
包装: 托盘
配用: ATSTK501-ND - ADAPTER KIT FOR 64PIN AVR MCU
59
ATmega103(L)
0945I–AVR–02/07
Prevent EEPROM
Corruption
During periods of low V
CC, the EEPROM Data can be corrupted because the supply volt-
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. Second, the CPU itself can execute instructions incorrectly if the sup-
ply 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
voltage. This is best done by an external low V
CC Reset Protection circuit, often
referred to as a Brown-out Detector (BOD). Please refer to application note “AVR
180” for design considerations regarding Power-on Reset and low-voltage
detection.
2.
Keep the AVR core in Power-down sleep mode during periods of low V
CC. This
will prevent the CPU from attempting to decode and execute instructions, effec-
tively protecting the EEPROM Registers from unintentional writes.
3.
Store constants in Flash memory if the ability to change memory contents from
software is not required. Flash memory cannot be updated by the CPU and will
not be subject to corruption.
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