- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄230911 > R5F3650RNFB MICROCONTROLLER, PQFP100 PDF資料下載
參數(shù)資料
| 型號： | R5F3650RNFB |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 14 MM, 0.50 MM PITCH, LQFP-100 |
| 文件頁數(shù)： | 20/81頁 |
| 文件大?。?/td> | 879K |
| 代理商： | R5F3650RNFB |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁
39
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
When switching between prescaler settings, the System Clock Prescaler ensures that no
glitches occurs in the clock system. It also ensures that no intermediate frequency is higher than
neither the clock frequency corresponding to the previous setting, nor the clock frequency corre-
sponding to the new setting. The ripple counter that implements the prescaler runs at the
frequency of the undivided clock, which may be faster than the CPU's clock frequency. Hence, it
is not possible to determine the state of the prescaler - even if it were readable, and the exact
time it takes to switch from one clock division to the other cannot be exactly predicted. From the
time the CLKPS values are written, it takes between T1 + T2 and T1 + 2 * T2 before the new
clock frequency is active. In this interval, 2 active clock edges are produced. Here, T1 is the pre-
vious clock period, and T2 is the period corresponding to the new prescaler setting.
To avoid unintentional changes of clock frequency, a special write procedure must be followed
to change the CLKPS bits:
1.
Write the Clock Prescaler Change Enable (CLKPCE) bit to one and all other bits in
CLKPR to zero.
2.
Within four cycles, write the desired value to CLKPS while writing a zero to CLKPCE.
Interrupts must be disabled when changing prescaler setting to make sure the write procedure is
not interrupted.
7.10.1
Clock Prescaler Register – CLKPR
Bit 7 – CLKPCE: Clock Prescaler Change Enable
The CLKPCE bit must be written to logic one to enable change of the CLKPS bits. The CLKPCE
bit is only updated when the other bits in CLKPR are simultaniosly written to zero. CLKPCE is
cleared by hardware four cycles after it is written or when CLKPS bits are written. Rewriting the
CLKPCE bit within this time-out period does neither extend the time-out period, nor clear the
CLKPCE bit.
Bits 3..0 – CLKPS3..0: Clock Prescaler Select Bits 3 - 0
These bits define the division factor between the selected clock source and the internal system
clock. These bits can be written run-time to vary the clock frequency to suit the application
requirements. As the divider divides the master clock input to the MCU, the speed of all synchro-
nous peripherals is reduced when a division factor is used. The division factors are given in
The CKDIV8 Fuse determines the initial value of the CLKPS bits. If CKDIV8 is unprogrammed,
the CLKPS bits will be reset to “0000”. If CKDIV8 is programmed, CLKPS bits are reset to
“0011”, giving a division factor of 8 at start up. This feature should be used if the selected clock
source has a higher frequency than the maximum frequency of the device at the present operat-
ing conditions. Note that any value can be written to the CLKPS bits regardless of the CKDIV8
Fuse setting. The Application software must ensure that a sufficient division factor is chosen if
Bit
7
654
3
2
1
0
CLKPCE
–
CLKPS3
CLKPS2
CLKPS1
CLKPS0
CLKPR
Read/Write
R/W
R
R/W
Initial Value
0
See Bit Description
相關PDF資料 |
PDF描述 |
|---|---|
| R5F3651ENFC | MICROCONTROLLER, PQFP128 |
| R5F3651KDFC | MICROCONTROLLER, PQFP128 |
| R5F21217KFP | 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP48 |
| R5F21275SNFP | 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP32 |
| R5F2L388ADFA | 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP80 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| R5F3650TDFA | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS MCU |
| R5F3650TDFA#U0 | 功能描述:MCU 4KB FLASH 768/16K 100-QFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:M16C™ M16C/60/65 標準包裝:96 系列:PIC® 16F 核心處理器:PIC 芯體尺寸:8-位 速度:20MHz 連通性:I²C，SPI 外圍設備:欠壓檢測/復位，POR，PWM，WDT 輸入/輸出數(shù):11 程序存儲器容量:3.5KB（2K x 14） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:128 x 8 電壓 - 電源 (Vcc/Vdd):2.3 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 包裝:管件 |
| R5F3650TDFB | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS MCU |
| R5F3650TDFB#30 | 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT 768KB FLASH 100QFP 制造商:Renesas Electronics Corporation 功能描述:M16C Series 16 bit 47 kB RAM 4 kB Flash 32 MHz Microcontroller - LQFP-100 |
| R5F3650TDFB#U0 | 功能描述:MCU 4KB FLASH 768/16K 100-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:M16C™ M16C/60/65 標準包裝:96 系列:PIC® 16F 核心處理器:PIC 芯體尺寸:8-位 速度:20MHz 連通性:I²C，SPI 外圍設備:欠壓檢測/復位，POR，PWM，WDT 輸入/輸出數(shù):11 程序存儲器容量:3.5KB（2K x 14） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:128 x 8 電壓 - 電源 (Vcc/Vdd):2.3 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復。