参数资料
型号: PIC16LC63T-04I/SO
厂商: Microchip Technology
文件页数: 69/126页
文件大小: 0K
描述: IC MCU OTP 4KX14 PWM 28SOIC
标准包装: 1,600
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 7KB(4K x 14)
程序存储器类型: OTP
RAM 容量: 192 x 8
电压 - 电源 (Vcc/Vdd): 2.5 V ~ 6 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
包装: 带卷 (TR)
47
AT90S/LS4433
1042H–AVR–04/03
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 can be done by enabling the internal Brown-out Detector (BOD) if
the operating speed matches the detection level. If not, an external low V
CC
Reset Protection circuit can be applied.
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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