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參數(shù)資料
| 型號(hào)： | R5F2L3AACDFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 18/74頁 |
| 文件大?。?/td> | 959K |
| 代理商： | R5F2L3AACDFP |
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26
2588F–AVR–06/2013
ATtiny261/461/861
mencing normal operation. The watchdog oscillator is used for timing this real-time part of the
start-up time. The number of WD oscillator cycles used for each time-out is shown in Table 6-2.
6.2.1
External Clock
To drive the device from an external clock source, CLKI should be driven as shown in Figure 6-
2. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
Figure 6-2.
External Clock Drive Configuration
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
When applying an external clock, it is required to avoid sudden changes in the applied clock fre-
quency to ensure stable operation of the MCU. A variation in frequency of more than 2% from
one clock cycle to the next can lead to unpredictable behavior. It is required to ensure that the
MCU is kept in Reset during such changes in the clock frequency.
Note that the system clock prescaler can be used to implement run-time changes of the internal
clock frequency. See “System Clock Prescaler” on page 31 for details.
6.2.2
High-Frequency PLL Clock
The internal PLL generates a clock signal with a frequency eight times higher than the source
input. The PLL uses the output of the internal 8 MHz oscillator as source and the default setting
generates a fast peripheral clock signal of 64 MHz.
Table 6-2.
Number of Watchdog Oscillator Cycles
Typ Time-out
Number of Cycles
4 ms
512
64 ms
8K (8,192)
Table 6-3.
Start-up Times for the External Clock Selection
SUT1:0
Start-up Time from Power-
down and Power-save
Additional Delay from
Reset
Recommended Usage
00
6 CK
14CK
BOD enabled
01
6 CK
14CK + 4 ms
Fast rising power
10
6 CK
14CK + 64 ms
Slowly rising power
11
Reserved
EXTERNAL
CLOCK
SIGNAL
CLKI
GND
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相關(guān)代理商/技術(shù)參數(shù) |
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| R5F2L3AACDFP#U1 | 制造商:Renesas Electronics Corporation 功能描述: |
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| R5F2L3AACNFP#V0 | 功能描述:MCU 1KB FLASH 96K ROM 100-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:R8C/Lx/3AC 標(biāo)準(zhǔn)包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設(shè)備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲(chǔ)器容量:40KB（20K x 16） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
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