參數(shù)資料
型號: ATMEGA644A-PU
廠商: Atmel
文件頁數(shù): 91/160頁
文件大?。?/td> 0K
描述: IC MCU AVR 64K FLASH 40PDIP
產品培訓模塊: MCU Product Line Introduction
megaAVR Introduction
標準包裝: 10
系列: AVR® ATmega
核心處理器: AVR
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 64KB(32K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 4K x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
數(shù)據轉換器: A/D 8x10b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
配用: ATSTK600-RC05-ND - STK600 ROUTING CARD AVR
36
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
To find suitable load capacitance for a 32.768kHz crysal, please consult the crystal datasheet.
When this oscillator is selected, start-up times are determined by the SUT Fuses and CKSEL0
as shown in Table 9-9.
Note:
1. These options should only be used if frequency stability at start-up is not important for the
application.
9.6
Calibrated Internal RC Oscillator
By default, the Internal RC Oscillator provides an approximate 8MHz clock. Though voltage and
temperature dependent, this clock can be very accurately calibrated by the the user. See Table
The device is shipped with the CKDIV8 Fuse programmed. See ”System Clock Prescaler” on
page 39 for more details.
This clock may be selected as the system clock by programming the CKSEL Fuses as shown in
Table 9-10. If selected, it will operate with no external components. During reset, hardware loads
the pre-programmed calibration value into the OSCCAL Register and thereby automatically cal-
ibrates the RC Oscillator. The accuracy of this calibration is shown as Factory calibration in
By changing the OSCCAL register from SW, see ”O(jiān)SCCAL – Oscillator Calibration Register” on
page 40, it is possible to get a higher calibration accuracy than by using the factory calibration.
The accuracy of this calibration is shown as User calibration in Table 28-10 on page 337.
When this Oscillator is used as the chip clock, the Watchdog Oscillator will still be used for the
Watchdog Timer and for the Reset Time-out. For more information on the pre-programmed cali-
bration value, see the section ”Calibration byte” on page 301.
Notes:
1. The device is shipped with this option selected.
2. If 8MHz frequency exceeds the specification of the device (depends on VCC), the CKDIV8
Fuse can be programmed in order to divide the internal frequency by 8.
Table 9-9.
Start-up times for the Low Frequency Crystal Oscillator Clock Selection.
Power conditions
Start-up time from
power-down and
power-save
Additional delay
from reset
(VCC = 5.0V)
CKSEL0
SUT1..0
BOD enabled
1K CK
14CK(1)
000
Fast rising power
1K CK
14CK + 4.1ms(1)
001
Slowly rising power
1K CK
14CK + 65ms(1)
010
Reserved
0
11
BOD enabled
32K CK
14CK
1
00
Fast rising power
32K CK
14CK + 4.1ms
1
01
Slowly rising power
32K CK
14CK + 65ms
1
10
Reserved
1
11
Table 9-10.
Internal Calibrated RC Oscillator Operating Modes.
Frequency range (2) [MHz]
CKSEL3..0
7.3 - 8.1
0010
相關PDF資料
PDF描述
46650-51 BNC RES CAP 50 OHMS
ATTINY26L-8SU ID MCU AVR 2K 5V 8MHZ 20-SOIC
ATTINY26L-8MU ID MCU AVR 2K 5V 8MHZ 32-QFN
ATTINY26-16SU IC AVR MCU 2K 16MHZ IND 20-SOIC
ATUC64D3-Z2UT IC MCU 32BIT 64KB FLASH 64VQFN
相關代理商/技術參數(shù)
參數(shù)描述
ATMEGA644P-15AT 功能描述:8位微控制器 -MCU AVR 64K FLSH 4K SRAM 2KB EE 20MHZ 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
ATMEGA644P-15AT1 功能描述:8位微控制器 -MCU AVR 64K FLSH 4K SRAM 2KB EE 20MHZ 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
ATMEGA644P-15AZ 功能描述:8位微控制器 -MCU AVR 64K FLSH 4K SRAM 2KB EE 20MHZ 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
ATMEGA644P-15MT 功能描述:8位微控制器 -MCU AVR 64K FLSH 4K SRAM 2KB EE 20MHZ 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
ATMEGA644P-15MT1 功能描述:8位微控制器 -MCU AVR 64K FLSH 4K SRAM 2KB EE 20MHZ 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT