參數(shù)資料
型號(hào): R5F21264SDFP
元件分類(lèi): 微控制器/微處理器
英文描述: 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP32
封裝: 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32
文件頁(yè)數(shù): 21/52頁(yè)
文件大?。?/td> 620K
代理商: R5F21264SDFP
45
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
Figure 11-3. MCU start-up, RESET extended externally.
11.2.2
External Reset
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the minimum pulse
width (see ”System and Reset characteristics” on page 297) 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 Volt-
age – V
RST – on its positive edge, the delay counter starts the MCU after the Time-out period – tTOUT – has expired.
Figure 11-4. External reset during operation.
11.2.3
Brown-out detection
Atmel ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P has an On-chip Brown-out
Detection (BOD) circuit for monitoring the V
CC level during operation by comparing it to a fixed trigger level. The
trigger level for the BOD can be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure
spike free Brown-out Detection. The hysteresis on the detection level should be interpreted as V
BOT+ = VBOT +
V
HYST/2 and VBOT- = VBOT - VHYST/2.When the BOD is enabled, and VCC decreases to a value below the trigger level
(V
BOT- in Figure 11-5), the Brown-out Reset is immediately activated. When VCC increases above the trigger level
(V
BOT+ in Figure 11-5), the delay counter starts the MCU after the Time-out period tTOUT has expired.
The BOD circuit will only detect a drop in V
CC if the voltage stays below the trigger level for longer than tBOD given
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC
CC
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