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參數(shù)資料
| 型號： | ATA6285N-PNPW |
| 廠商： | ATMEL CORP |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, QCC32 |
| 封裝： | 5 X 5MM, QFN-32 |
| 文件頁數(shù)： | 42/121頁 |
| 文件大?。?/td> | 9917K |
| 代理商： | ATA6285N-PNPW |
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4958B–AUTO–11/10
Atmel ATA6285/ATA6286 [Preliminary]
The next code examples show assembly and C functions for reading the EEPROM. The exam-
ples assume that interrupts are controlled so that no interrupts will occur during execution of
these functions.
3.6.5.5
Preventing EEPROM Corruption
During periods of low V
CC, the EEPROM data can be corrupted because the supply voltage is
too low for the CPU and the EEPROM to operate properly. These issues are the same as for
board level systems using 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. Sec-
ondly, the CPU itself can execute instructions incorrectly, if the supply voltage is too low.
EEPROM data corruption can easily be avoided by following this design recommendation:
Keep the Atmel 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 detection level of the
internal BOD does not match the needed detection level, an external low V
CC 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 voltage is sufficient.
Assembly Code Example
EEPROM_read:
; Wait for completion of previous write
sbic EECR,EEWE
rjmp EEPROM_read
; Set up address (r18:r17) in address register
out EEARH, r18
out EEARL, r17
; Start eeprom read by writing EERE
sbi EECR,EERE
; Read data from Data Register
in r16,EEDR
ret
C Code Example
unsigned char EEPROM_read(unsigned int uiAddress)
{
/* Wait for completion of previous write */
while(EECR & (1<<EEWE))
;
/* Set up address register */
EEAR = uiAddress;
/* Start eeprom read by writing EERE */
EECR |= (1<<EERE);
/* Return data from Data Register */
return EEDR;
}
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ATA6285N-PNQW | 功能描述:射頻微控制器 - MCU IC LF, Cap. Sens. Interface RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:Si100x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:24 MHz 程序存儲器大小:64 KB 數(shù)據(jù) RAM 大小:4 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LGA-42 安裝風(fēng)格:SMD/SMT 封裝:Tube |
| ATA6285-PNPW | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:TPMS Control and Transmitter IC |
| ATA6285-PNQW | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:TPMS Control and Transmitter IC |
| ATA6286 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:TPMS Control and Transmitter IC |
| ATA6286C-PNPW | 制造商:Atmel Corporation 功能描述:IC CTLR/XMITTER 433MHZ 32QFN 制造商:Atmel Corporation 功能描述:Active RFID AVR-uC, 125kHz + 433MHz |
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