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參數(shù)資料
| 型號： | R5F21274JFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP32 |
| 封裝： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件頁數(shù)： | 5/52頁 |
| 文件大小： | 620K |
| 代理商： | R5F21274JFP |
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30
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
9.5
XTAL oscillator
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be configured for use as
an On-chip Oscillator, as shown in Figure 9-2. Either a quartz XTAL or a ceramic resonator may be used.
C1 and C2 should always be equal for both XTALs and resonators. The optimal value of the capacitors depends on
the XTAL or resonator in use, the amount of stray capacitance, and the electromagnetic noise of the environment.
Some initial guidelines for choosing capacitors for use with XTALs are given in Table 9-5. For ceramic resonators,
the capacitor values given by the manufacturer should be used.
Figure 9-2.
XTAL oscillator connections.
The Oscillator can operate in three different modes, each optimized for a specific frequency range. The operating
mode is selected by the fuses CKSEL3:1 as shown in Table 9-5.
Notes:
1. This option should not be used with XTALs, only with ceramic resonators.
The CKSEL0 fuse together with the SUT1:0 fuses select the start-up times as shown in Table 9-6.
Table 9-5.
XTAL oscillator operating modes.
CKSEL3:1
Frequency range [MHz]
Recommended range for capacitors C1 and
C2 for use with XTALs [pF]
100(1)
0.4 - 0.9
–
101
0.9 - 3.0
12 - 22
110
3.0 - 8.0
12 - 22
111
8.0 -
12 - 22
Table 9-6.
Start-up times for the XTAL oscillator clock selection.
CKSEL0
SUT1:0
Start-up time from
power-down and
power-save
Additional delay
from reset
(VCC = 5.0V)
Recommended usage
0
00
258CK (1)
14CK + 4.1ms
Ceramic resonator, fast
rising power
0
01
258CK (1)
14CK + 65ms
Ceramic resonator, slowly
rising power
010
1K CK (2)
14CK
Ceramic resonator, BOD
enabled
011
1K CK (2)
14CK + 4.1ms
Ceramic resonator, fast
rising power
100
1K CK (2)
14CK + 65ms
Ceramic resonator, slowly
rising power
XTAL2 (TOSC2)
XTAL1 (TOSC1)
GND
C2
C1
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| R5F21274JFP#U0 | 功能描述:MCU FLASH 2K FLASH 16K 32LQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:R8C/2x/27 標準包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設備:POR，PWM，WDT 輸入/輸出數(shù):40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 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 ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
| R5F21274JFP#W4 | 制造商:Renesas Electronics Corporation 功能描述:MCU 3/5V - Tape and Reel |
| R5F21274JXXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MCU |
| R5F21274KFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/2x SERIES |
| R5F21274KXXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MCU |
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