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参数资料
型号： ATMEGA164A-PU
厂商： Atmel
文件页数： 90/160页
文件大小： 0K
描述： IC MCU AVR 16K 20MHZ 40PDIP
产品培训模块： MCU Product Line Introduction
megaAVR Introduction
标准包装： 14
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： 16KB（8K x 16）
程序存储器类型： 闪存
EEPROM 大小： 512 x 8
RAM 容量： 1K 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： 40-DIP（0.600"，15.24mm）
包装： 管件
配用： ATSTK600-RC05-ND - STK600 ROUTING CARD AVR
35
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
2. These options are intended for use with ceramic resonators and will ensure frequency stability
at start-up. They can also be used with crystals when not operating close to the maximum fre-
quency of the device, and if frequency stability at start-up is not important for the application.
9.5
Low Frequency Crystal Oscillator
The Low-frequency Crystal Oscillator is optimized for use with a 32.768kHz watch crystal. When
selecting crystals, load capasitance and crystal’s Equivalent Series Resistance, ESR must be
ta ken into cons ideration. Both values ar e specified by the crystal vendor. Atmel
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P oscillator is optimized for very low
power consumption, and thus when selecting crystals, see Table 9-7 on page 35 for maximum
ESR recommendations on 9pF and 12.5pF crystals.
Note:
1. Maximum ESR is typical value based on characterization.
The Low-frequency Crystal Oscillator provides an internal load capacitance, see Table on page
35 at each TOSC pin.
The capacitance (Ce + Ci) needed at each TOSC pin can be calculated by using:
where:
Ce - is optional external capacitors as described in Figure 9-2 on page 32
Ci - is is the pin capacitance in Table 9-8 on page 35
CL - is the load capacitance for a 32.768kHz crystal specified by the crystal vendor.
C
S - is the total stray capacitance for one TOSC pin.
Crystals specifying load capacitance (CL) higher than the ones given in the Table 9-8 on page
35, require external capacitors applied as described in Figure 9-2 on page 32.
Figure 9-3.
Crystal oscillator connections.
Crystals specifying load capacitance (CL) higher than listed in Table 9-8 on page 35, require
external capacitors applied as described in Figure 9-2 on page 32.
Table 9-7.
Maximum ESR Recommendation for 32.768kHz Watch Crystal.
Crystal CL [pF]
Max ESR [k
](1)
9.0
65
12.5
30
Table 9-8.
Capacitance for Low-frequency oscillator.
Device
32kHz osc. type
Cap (Xtal1/Tosc1)
Cap (Xtal2/Tosc2)
ATmega164A/164PA/324A/324PA/
644A/644PA/1284/1284P
System osc.
18pF
8pF
Timer osc.
6pF
Ce
Ci
+
2 CL
C
s
–
=
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