参数资料
型号: ATMEGA324PA-PU
厂商: Atmel
文件页数: 89/160页
文件大小: 0K
描述: MCU AVR 32KB FLASH 40PDIP
产品培训模块: MCU Product Line Introduction
megaAVR Introduction
标准包装: 10
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: 40-DIP(0.600",15.24mm)
包装: 管件
配用: ATSTK600-RC05-ND - STK600 ROUTING CARD AVR
ATSTK600-ND - DEV KIT FOR AVR/AVR32
34
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
Notes:
1. These options should only be used when not operating close to the maximum frequency of the
device, and only if frequency stability at start-up is not important for the application. These
options are not suitable for crystals.
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.
9.4
Full swing Crystal Oscillator
This Crystal Oscillator is a full swing oscillator, with rail-to-rail swing on the XTAL2 output. This is
useful for driving other clock inputs and in noisy environments. The current consumption is
higher than the ”Low Power Crystal Oscillator” on page 33. Note that the Full Swing Crystal
Oscillator will only operate for Vcc = 2.7 - 5.5 volts.
Some initial guidelines for choosing capacitors for use with crystals are given in Table 9-6. The
crystal should be connected as described in ”Clock source connections” on page 32.
The operating mode is selected by the fuses CKSEL3..1 as shown in Table 9-5.
Notes:
1. If the crystal frequency exceeds the specification of the device (depends on V
CC), the CKDIV8
Fuse can be programmed in order to divide the internal frequency by 8. It must be ensured
that the resulting divided clock meets the frequency specification of the device.
Notes:
1. These options should only be used when not operating close to the maximum frequency of the
device, and only if frequency stability at start-up is not important for the application. These
options are not suitable for crystals.
Table 9-5.
Full Swing Crystal Oscillator Operating Modes.
Frequency range (1) [MHz]
CKSEL3..1
Recommended Range for Capacitors C1 and C2 [pF]
0.4 - 20
011
12 - 22
Table 9-6.
Start-up times for the Full Swing Crystal Oscillator Clock Selection.
Oscillator source /
power conditions
Start-up time from
power-down and
power-save
Additional delay
from reset
(V
CC = 5.0V)
CKSEL0
SUT1..0
Ceramic resonator,
fast rising power
258CK
14CK + 4.1ms(1)
000
Ceramic resonator,
slowly rising power
258CK
14CK + 65ms(1)
001
Ceramic resonator,
BOD enabled
1K CK
14CK(2)
010
Ceramic resonator,
fast rising power
1K CK
14CK + 4.1ms(2)
011
Ceramic resonator,
slowly rising power
1K CK
14CK + 65ms(2)
100
Crystal Oscillator,
BOD enabled
16K CK
14CK
1
01
Crystal Oscillator,
fast rising power
16K CK
14CK + 4.1ms
1
10
Crystal Oscillator,
slowly rising power
16K CK
14CK + 65ms
1
11
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