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| 型号： | R5F6411FDFN |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 50 MHz, MICROCONTROLLER, PQFP64 |
| 封装： | 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64 |
| 文件页数： | 67/84页 |
| 文件大小： | 1206K |
| 代理商： | R5F6411FDFN |
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83
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
15.4
Counter Unit
The main part of the 8-bit Timer/Counter is the programmable bi-directional counter unit. Figure 15-2 shows a block diagram
of the counter and its surroundings.
Figure 15-2. Counter Unit Block Diagram
Signal description (internal signals):
count
Increment or decrement TCNT0 by 1.
direction
Select between increment and decrement.
clear
Clear TCNT0 (set all bits to zero).
clkTn
Timer/Counter clock, referred to as clkT0 in the following.
top
Signalize that TCNT0 has reached maximum value.
bottom
Signalize that TCNT0 has reached minimum value (zero).
Depending of the mode of operation used, the counter is cleared, incremented, or decremented at each timer clock (clkT0).
clkT0 can be generated from an external or internal clock source, selected by the clock select bits (CS02:0). When no clock
source is selected (CS02:0 = 0) the timer is stopped. However, the TCNT0 value can be accessed by the CPU, regardless of
whether clkT0 is present or not. A CPU write overrides (has priority over) all counter clear or count operations.
The counting sequence is determined by the setting of the WGM01 and WGM00 bits located in the Timer/Counter control
register (TCCR0A) and the WGM02 bit located in the Timer/Counter control register B (TCCR0B). There are close
connections between how the counter behaves (counts) and how waveforms are generated on the output compare outputs
OC0A and OC0B. For more details about advanced counting sequences and waveform generation, see
The Timer/Counter overflow flag (TOV0) is set according to the mode of operation selected by the WGM02:0 bits. TOV0 can
be used for generating a CPU interrupt.
top
bottom
TOVn
(Int. Req.)
DATA BUS
Control Logic
TCNTn
clkTn
clear
count
direction
Edge
Detector
(from Prescaler)
Clock Select
Tn
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| R5F6411FDFN#UA | 功能描述:MCU 256+8KB FLASH 32K 64-LQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:M16C/R32C/100/111 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 |
| R5F6411FDFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:RENESAS MCU |
| R5F6411FDLG | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:RENESAS MCU |
| R5F6411FNFN | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:RENESAS MCU |
| R5F6411FNFN#U0 | 制造商:Renesas Electronics Corporation 功能描述:MCU 5.5V 512K ROM - Trays |
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