- 您现在的位置：买卖IC网 > PDF目录69313 > R5F3650KNFB MICROCONTROLLER, PQFP100 PDF资料下载
参数资料
| 型号： | R5F3650KNFB |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 14 MM, 0.50 MM PITCH, LQFP-100 |
| 文件页数： | 66/81页 |
| 文件大小： | 879K |
| 代理商： | R5F3650KNFB |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页当前第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页
84
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
13. Timer/Counter0 and Timer/Counter1 Prescalers
Timer/Counter1 and Timer/Counter0 share the same prescaler module, but the Timer/Counters
can have different prescaler settings. The description below applies to both Timer/Counter1 and
Timer/Counter0.
13.1
Internal Clock Source
The Timer/Counter can be clocked directly by the system clock (by setting the CSn2:0 = 1). This
provides the fastest operation, with a maximum Timer/Counter clock frequency equal to system
clock frequency (f
CLK_I/O). Alternatively, one of four taps from the prescaler can be used as a
clock source. The prescaled clock has a frequency of either f
CLK_I/O/8, fCLK_I/O/64, fCLK_I/O/256, or
f
CLK_I/O/1024.
13.2
Prescaler Reset
The prescaler is free running, i.e., operates independently of the Clock Select logic of the
Timer/Counter, and it is shared by Timer/Counter1 and Timer/Counter0. Since the prescaler is
not affected by the Timer/Counter’s clock select, the state of the prescaler will have implications
for situations where a prescaled clock is used. One example of prescaling artifacts occurs when
the timer is enabled and clocked by the prescaler (6 > CSn2:0 > 1). The number of system clock
cycles from when the timer is enabled to the first count occurs can be from 1 to N+1 system
clock cycles, where N equals the prescaler divisor (8, 64, 256, or 1024).
It is possible to use the prescaler reset for synchronizing the Timer/Counter to program execu-
tion. However, care must be taken if the other Timer/Counter that shares the same prescaler
also uses prescaling. A prescaler reset will affect the prescaler period for all Timer/Counters it is
connected to.
13.3
External Clock Source
An external clock source applied to the Tn/T0 pin can be used as Timer/Counter clock
(clk
T1/clkT0). The Tn/T0 pin is sampled once every system clock cycle by the pin synchronization
logic. The synchronized (sampled) signal is then passed through the edge detector. Figure 13-1
shows a functional equivalent block diagram of the Tn/T0 synchronization and edge detector
logic. The registers are clocked at the positive edge of the internal system clock (clk
I/O). The latch
is transparent in the high period of the internal system clock.
The edge detector generates one clk
T1/clkT0 pulse for each positive (CSn2:0 = 7) or negative
(CSn2:0 = 6) edge it detects.
Figure 13-1. Tn/T0 Pin Sampling
The synchronization and edge detector logic introduces a delay of 2.5 to 3.5 system clock cycles
from an edge has been applied to the Tn/T0 pin to the counter is updated.
Enabling and disabling of the clock input must be done when Tn/T0 has been stable for at least
one system clock cycle, otherwise it is a risk that a false Timer/Counter clock pulse is generated.
Tn_sync
(To Clock
Select Logic)
Edge Detector
Synchronization
DQ
LE
DQ
Tn
clk
I/O
相关PDF资料 |
PDF描述 |
|---|---|
| R5F3650NNFB | MICROCONTROLLER, PQFP100 |
| R5F36B3ENNP | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQCC64 |
| R5F36CAKNFA | 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP100 |
| R5F36CAKNFB | 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP100 |
| R5F36CA6DFA | 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP100 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| R5F3650KNFB#U0 | 功能描述:MCU 4KB FLASH 384/16K 100-LQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:M16C™ M16C/60/65 标准包装:96 系列:PIC® 16F 核心处理器:PIC 芯体尺寸:8-位 速度:20MHz 连通性:I²C，SPI 外围设备:欠压检测/复位，POR，PWM，WDT 输入/输出数:11 程序存储器容量:3.5KB（2K x 14） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:128 x 8 电压 - 电源 (Vcc/Vdd):2.3 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 包装:管件 |
| R5F3650MCDFA | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:televisions, household appliances, office equipment, communication devices |
| R5F3650MCDFB | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:televisions, household appliances, office equipment, communication devices |
| R5F3650MCNFA | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:televisions, household appliances, office equipment, communication devices |
| R5F3650MCNFB | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:televisions, household appliances, office equipment, communication devices |
发布紧急采购，3分钟左右您将得到回复。