参数资料
型号: ATMEGA324PA-MCH
厂商: Atmel
文件页数: 87/160页
文件大小: 0K
描述: MCU AVR 32KB FLASH 44-VQFN
产品培训模块: MCU Product Line Introduction
megaAVR Introduction
标准包装: 490
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 32KB(16K x 16)
程序存储器类型: 闪存
EEPROM 大小: 1K x 8
RAM 容量: 2K x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-VQFN 裸露焊盘
包装: 托盘
配用: ATSTK600-ND - DEV KIT FOR AVR/AVR32
32
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
selectable delays are shown in Table 9-2. The frequency of the Watchdog Oscillator is voltage
Main purpose of the delay is to keep the AVR in reset until it is supplied with minimum Vcc. The
delay will not monitor the actual voltage and it will be required to select a delay longer than the
Vcc rise time. If this is not possible, an internal or external Brown-Out Detection circuit should be
used. A BOD circuit will ensure sufficient Vcc before it releases the reset, and the time-out delay
can be disabled. Disabling the time-out delay without utilizing a Brown-Out Detection circuit is
not recommended.
The oscillator is required to oscillate for a minimum number of cycles before the clock is consid-
ered stable. An internal ripple counter monitors the oscillator output clock, and keeps the internal
reset active for a given number of clock cycles. The reset is then released and the device will
start to execute. The recommended oscillator start-up time is dependent on the clock type, and
varies from 6 cycles for an externally applied clock to 32K cycles for a low frequency crystal.
The start-up sequence for the clock includes both the time-out delay and the start-up time when
the device starts up from reset. When starting up from Power-save or Power-down mode, Vcc is
assumed to be at a sufficient level and only the start-up time is included.
9.2.3
Clock source connections
The pins XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which
can be configured for use as an On-chip Oscillator, as shown in Figure 9-2 on page 32. Either a
quartz crystal or a ceramic resonator may be used.
C1 and C2 should always be equal for both crystals and resonators. The optimal value of the
capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and the
electromagnetic noise of the environment. For ceramic resonators, the capacitor values given by
the manufacturer should be used.
Figure 9-2.
Crystal oscillator connections.
Table 9-2.
Number of Watchdog Oscillator Cycles.
Typical time-out (V
CC = 5.0V)
Typical time-out (V
CC = 3.0V)
Number of cycles
0ms
0
4.1ms
4.3ms
512
65ms
69ms
8K (8,192)
XTAL2
XTAL1
GND
C2
C1
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