参数资料
型号: ATMEGA644PA-MUR
厂商: Atmel
文件页数: 139/160页
文件大小: 0K
描述: IC MCU AVR 64K FLASH 44VQFN
产品培训模块: MCU Product Line Introduction
megaAVR Introduction
标准包装: 4,000
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: 64KB(32K x 16)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 4K 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-VFQFN 裸露焊盘
包装: 带卷 (TR)
其它名称: ATMEGA644PA-MUR-ND
ATMEGA644PA-MURTR
8
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port C pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
Port C also serves the functions of the JTAG interface, along with special features of the Atmel
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on page 85.
2.3.6
Port D (PD7:PD0)
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port D output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port D pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
Po rt
D
al so
ser v e s
t h e
f u nct i o n s
o f
va ri ou s
sp eci a l
f e at u r e s
of
t h e
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on page 88.
2.3.7
RESET
Reset input. A low level on this pin for longer than the minimum pulse length will generate a
reset, even if the clock is not running. The minimum pulse length is given in ”” on page 337.
Shorter pulses are not guaranteed to generate a reset.
2.3.8
XTAL1
Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.
2.3.9
XTAL2
Output from the inverting Oscillator amplifier.
2.3.10
AVCC
AVCC is the supply voltage pin for Port A and the Analog-to-digital Converter. It should be exter-
nally connected to V
CC, even if the ADC is not used. If the ADC is used, it should be connected
to V
CC through a low-pass filter.
2.3.11
AREF
This is the analog reference pin for the Analog-to-digital Converter.
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