参数资料
型号: SC16C2550BIBS,151
厂商: NXP Semiconductors
文件页数: 26/31页
文件大小: 0K
描述: IC UART DUAL W/FIFO 32-HVQFN
产品培训模块: Stand-Alone UARTs
标准包装: 490
特点: 故障启动位检测
通道数: 2,DUART
FIFO's: 16 字节
电源电压: 2.5V,3.3V,5V
带自动流量控制功能:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
供应商设备封装: 32-HVQFN(5x5)
包装: 托盘
产品目录页面: 828 (CN2011-ZH PDF)
其它名称: 568-3259
935280309151
SC16C2550BIBS-S
43
2570N–AVR–05/11
ATmega325/3250/645/6450
Figure 11-3. MCU Start-up, RESET Extended Externally
11.4
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 301) 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.
Figure 11-4. External Reset During Operation
11.5
Brown-out Detection
Atmel ATmega325/3250/645/6450 has an On-chip Brown-out Detection (BOD) circuit for moni-
toring 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 + VHYST/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 on page 44), the Brown-out
Reset is immediately activated. When V
CC increases above the trigger level (VBOT+ in Figure 11-
5 on page 44), the delay counter starts the MCU after the Time-out period t
TOUT has expired.
The BOD circuit will only detect a drop in V
CC if the voltage stays below the trigger level for lon-
ger than t
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC
CC
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