參數(shù)資料
型號: ATMEGA324P-B15AZ
廠商: Atmel
文件頁數(shù): 47/70頁
文件大小: 0K
描述: IC MCU 8BIT 32KB FLASH 44TQFP
標(biāo)準(zhǔn)包裝: 1,500
系列: AVR® ATmega
核心處理器: AVR
芯體尺寸: 8-位
速度: 16MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 44-TQFP
包裝: 帶卷 (TR)
其它名稱: ATMEGA324P-B15AZ-ND
36
7674F–AVR–09/09
ATmega164P/324P/644P
7.6
Calibrated Internal RC Oscillator
By default, the Internal RC Oscillator provides an approximate 8 MHz 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 38 for more details.
This clock may be selected as the system clock by programming the CKSEL Fuses as shown in
Table 7-10. 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 “OSCCAL – Oscillator Calibration Register” on
page 39, 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 26-2 on page 331.
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 299.
Notes:
1. The device is shipped with this option selected.
2. Typical values.
3. If 8 MHz 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.
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Note:
1.
The device is shipped with this option selected.
Table 7-10.
Internal Calibrated RC Oscillator Operating Modes
Frequency Range(2) (MHz)
CKSEL3..0
7.7 - 8.3
0010
Table 7-11.
Start-up times for the Internal Calibrated RC Oscillator clock selection
Power Conditions
Start-up Time from
Power-down and Power-save
Additional Delay from
Reset (VCC = 5.0V)
SUT1..0
BOD enabled
6 CK
14CK
00
Fast rising power
6 CK
14CK + 4.1 ms
01
Slowly rising power
6 CK
14CK + 65 ms(1)
10
Reserved
11
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