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参数资料
型号： MB9AF314MPMC
元件分类： 微控制器/微处理器
英文描述： 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP80
封装： 0.50 MM PITCH, PLASTIC, LQFP-80
文件页数： 53/114页
文件大小： 1357K
代理商： MB9AF314MPMC
43
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
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
Section 29.5 “System and Reset Characteristics” on page 272) 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 – VRST – on its
positive edge, the delay counter starts the MCU after the time-out period – tTOUT – has expired. The external reset can be
disabled by the RSTDISBL fuse, see Table 28-6 on page 253.
Figure 11-4. External Reset During Operation
11.5
Brown-out Detection
The Atmel ATmega48PA/88PA/168PA has an on-chip brown-out detection (BOD) circuit for monitoring the VCC 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 VBOT+ = VBOT + VHYST/2 and VBOT- = VBOT – VHYST/2.When the BOD is enabled, and VCC decreases to a value
below the trigger level (VBOT- in Figure 11-5), the brown-out reset is immediately activated. When VCC increases above the
trigger level (VBOT+ 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 VCC if the voltage stays below the trigger level for longer than tBOD given in
Section 29.5 “System and Reset Characteristics” on page 272.
Figure 11-5. Brown-out Reset During Operation
V
CC
RESET
INTERNAL
RESET
TIME-OUT
V
RST
t
TOUT
V
POT
tTOUT
RESET
VCC
INTERNAL
RESET
TIME-OUT
V
RST
V
BOT-
V
BOT+
t
TOUT
V
CC
RESET
INTERNAL
RESET
TIME-OUT
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