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鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉锛� | ATMEGA48-15MZ |
| 寤犲晢锛� | Atmel |
| 鏂囦欢闋佹暩(sh霉)锛� | 135/240闋� |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | MCU AVR 4K FLASH 15MHZ 32-QFN |
| 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� | megaAVR Introduction |
| 妯欐簴鍖呰锛� | 1 |
| 绯诲垪锛� | AVR® ATmega |
| 鏍稿績铏曠悊鍣細 | AVR |
| 鑺珨灏哄锛� | 8-浣� |
| 閫熷害锛� | 16MHz |
| 閫ｉ€氭€э細 | I²C锛孲PI锛孶ART/USART |
| 澶栧湇瑷�(sh猫)鍌欙細 | 娆犲妾㈡脯/寰�(f霉)浣�锛孭OR锛孭WM锛學DT |
| 杓稿叆/杓稿嚭鏁�(sh霉)锛� | 23 |
| 绋嬪簭瀛樺劜鍣ㄥ閲忥細 | 4KB锛�2K x 16锛� |
| 绋嬪簭瀛樺劜鍣ㄩ鍨嬶細 | 闁冨瓨 |
| EEPROM 澶�?銆�?/td> | 256 x 8 |
| RAM 瀹归噺锛� | 512 x 8 |
| 闆诲 - 闆绘簮 (Vcc/Vdd)锛� | 2.7 V ~ 5.5 V |
| 鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� | A/D 8x10b |
| 鎸暕鍣ㄥ瀷锛� | 鍏�(n猫i)閮� |
| 宸ヤ綔婧害锛� | -40°C ~ 125°C |
| 灏佽/澶栨锛� | 32-VFQFN 瑁搁湶鐒婄洡 |
| 鍖呰锛� | 鍓垏甯� (CT) |
| 鍏跺畠鍚嶇ū锛� | ATMEGA48-15MZCT |
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22
7530J鈥揂VR鈥�03/12
Atmel ATmega48/88/168 Automotive
5.3.5
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 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 com-
pleted provided that the power supply voltage is sufficient.
Assembly Code Example
EEPROM_read:
; Wait for completion of previous write
sbic
EECR,EEPE
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<<EEPE))
;
/* Set up address register */
EEAR = uiAddress;
/* Start eeprom read by writing EERE */
EECR |= (1<<EERE);
/* Return data from Data Register */
return EEDR;
}
鐩搁棞(gu膩n)PDF璩囨枡 |
PDF鎻忚堪 |
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| CAT9534YI-GT2 | IC I/O EXPANDER I2C 8B 16TSSOP |
| CAT9534WI-GT2 | IC I/O EXPANDER I2C 8B 16SOIC |
| ATMEGA8535L-8MUR | MCU AVR 8K FLASH 8MHZ 44QFN |
鐩搁棞(gu膩n)浠ｇ悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉) |
鍙冩暩(sh霉)鎻忚堪 |
|---|---|
| ATmega48-20AI | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU AVR 4K FLSH 256B EE 512B SRAM ADC 5V RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| ATMEGA48-20AJ | 鍔熻兘鎻忚堪:IC AVR MCU 4K 5V 20MHZ 32-TQFP RoHS:鏄� 椤炲垾:闆嗘垚闆昏矾 (IC) >> 宓屽叆寮� - 寰帶鍒跺櫒锛� 绯诲垪:AVR® ATmega 妯欐簴鍖呰:9 绯诲垪:87C 鏍稿績铏曠悊鍣�:8051 鑺珨灏哄:8-浣� 閫熷害:40/20MHz 閫ｉ€氭€�:UART/USART 澶栧湇瑷�(sh猫)鍌�:POR锛學DT 杓稿叆/杓稿嚭鏁�(sh霉):32 绋嬪簭瀛樺劜鍣ㄥ閲�:32KB锛�32K x 8锛� 绋嬪簭瀛樺劜鍣ㄩ鍨�:OTP EEPROM 澶у皬:- RAM 瀹归噺:256 x 8 闆诲 - 闆绘簮 (Vcc/Vdd):4.5 V ~ 5.5 V 鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒:- 鎸暕鍣ㄥ瀷:鍏�(n猫i)閮� 宸ヤ綔婧害:0°C ~ 70°C 灏佽/澶栨:40-DIP锛�0.600"锛�15.24mm锛� 鍖呰:绠′欢 |
| ATmega48-20AU | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 4kB Flash 0.256kB EEPROM 23 I/O Pins RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| ATMEGA48-20AU/B | 鍒堕€犲晢:Atmel Corporation 鍔熻兘鎻忚堪: |
| ATMEGA48-20AUR | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU AVR 4KB FL 256B EE 512B EE 20MHZ IND RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
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