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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)： | 6/52頁 |
| 文件大?。?/td> | 620K |
| 代理商： | R5F21274JFP |
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31
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
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 XTALs.
2. These options are intended for use with ceramic resonators and will ensure frequency stability at start-up. They can
also be used with XTALs when not operating close to the maximum frequency of the device, and if frequency stabil-
ity at start-up is not important for the application.
9.6
Low-frequency XTAL Oscillator
The Low-frequency XTAL Oscillator is optimized for use with a 32.768kHz watch XTAL. When selecting XTALs,
load capacitance and XTAL’s Equivalent Series Resistance, ESR must be taken into consideration. Both values
ar e
spe c if ie d
by
the
XT AL
v end or .
Atm e l
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P oscillator is optimized for very low
power consumption, and thus when selecting XTALs, see Table 9-7 for maximum ESR recommendations on 9pF
and 6.5pF XTALs.
Note:
1. Maximum ESR is typical value based on characterization.
The low-frequency XTAL oscillator provides an internal load capacitance, see Table 9-9 on page 32 at each TOSC
pin.
ATmega325A/325PA/3250A/3250PA/645A/645P/6450A/6450P oscillator is optimized for very low power con-
sumption, and thus when selecting XTALs, see Table 9-8 on page 31 for maximum ESR recommendations on
6.5 pF, 9.0 pF and 12.5 pF XTALs.
Table 9-8.
Maximum ESR recommendation for 32.768kHz watch XTAL Atmel
ATmega325A/325PA/3250A/3250PA/645A/645P/6450A/6450P.
Note:
1. Maximum ESR is typical value based on characterization.
101
16K CK
14CK
XTAL Oscillator, BOD
enabled
1
10
16K CK
14CK + 4.1ms
XTAL Oscillator, fast rising
power
1
11
16K CK
14CK + 65ms
XTAL Oscillator, slowly
rising power
Table 9-6.
Start-up times for the XTAL oscillator clock selection. (Continued)
CKSEL0
SUT1:0
Start-up time from
power-down and
power-save
Additional delay
from reset
(V
CC = 5.0V)
Recommended usage
Table 9-7.
Maximum ESR recommendation for 32.768kHz watch XTAL ATmega165A/ATmega165PA.
XTAL CL [pF]
Max ESR [k
] (1)
6.5
60
935
XTAL CL [pF]
Max ESR [k
] (1)
6.5
75
9.0
65
12.5
30
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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(biāo)準(zhǔn)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(shè)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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