Motore di ricerca datesheet componenti elettronici |
|
ATmega128 Scheda tecnica(PDF) 52 Page - ATMEL Corporation |
|
ATmega128 Scheda tecnica(HTML) 52 Page - ATMEL Corporation |
52 / 386 page 52 2467S–AVR–07/09 ATmega128 2. VBOT may be below nominal minimum operating voltage for some devices. For devices where this is the case, the device is tested down to V CC = VBOT during the production test. This guar- antees that a Brown-out Reset will occur before V CC drops to a voltage where correct operation of the microcontroller is no longer guaranteed. The test is performed using BODLEVEL=1for ATmega128L and BODLEVEL=0 for ATmega128. BODLEVEL=1 is not applicable forATmega128 Power-on Reset A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level is defined in Table 19. The POR is activated whenever V CC is below the detection level. The POR circuit can be used to trigger the Start-up Reset, as well as to detect a failure in supply voltage. A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the Power-on Reset threshold voltage invokes the delay counter, which determines how long the device is kept in RESET after V CC rise. The RESET signal is activated again, without any delay, when V CC decreases below the detection level. Figure 23. MCU Start-up, RESET Tied to V CC. Figure 24. MCU Start-up, RESET Extended Externally External Reset An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the minimum pulse width (see Table 19) will generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset. When the applied signal reaches the Reset Threshold Voltage – V RST on its positive edge, the delay counter starts the MCU after the Time-out period t TOUT has expired. V RESET TIME-OUT INTERNAL RESET t TOUT V POT V RST CC RESET TIME-OUT INTERNAL RESET t TOUT V POT V RST VCC |
Codice articolo simile - ATmega128 |
|
Descrizione simile - ATmega128 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |