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ATMEGA48V-10MMHR 参数 Datasheet PDF下载

ATMEGA48V-10MMHR图片预览
型号: ATMEGA48V-10MMHR
PDF下载: 下载PDF文件 查看货源
内容描述: [RISC Microcontroller, 8-Bit, FLASH, AVR RISC CPU, 10MHz, CMOS, PQCC28, 4 X 4 MM, 1 MM HEIGHT, 0.45 MM PITCH, GREEN, PLASTIC, VQFN-28]
分类和应用: 闪存微控制器
文件页数/大小: 376 页 / 4764 K
品牌: ATMEL [ ATMEL ]
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ATmega48/88/168  
17. 8-bit Timer/Counter2 with PWM and Asynchronous Operation  
17.1 Features  
Single Channel Counter  
Clear Timer on Compare Match (Auto Reload)  
Glitch-free, Phase Correct Pulse Width Modulator (PWM)  
Frequency Generator  
10-bit Clock Prescaler  
Overflow and Compare Match Interrupt Sources (TOV2, OCF2A and OCF2B)  
Allows Clocking from External 32 kHz Watch Crystal Independent of the I/O Clock  
17.2 Overview  
Timer/Counter2 is a general purpose, single channel, 8-bit Timer/Counter module. A simplified  
block diagram of the 8-bit Timer/Counter is shown in Figure 17-1. For the actual placement of  
I/O pins, refer to “Pinout ATmega48/88/1682545M” on page 2. CPU accessible I/O Registers,  
including I/O bits and I/O pins, are shown in bold. The device-specific I/O Register and bit loca-  
tions are listed in the “Register Description” on page 154.  
The PRTIM2 bit in “Minimizing Power Consumption” on page 42 must be written to zero to  
enable Timer/Counter2 module.  
Figure 17-1. 8-bit Timer/Counter Block Diagram  
Count  
TOVn  
(Int.Req.)  
Clear  
Control Logic  
Clock Select  
Direction  
clkTn  
Edge  
Detector  
Tn  
TOP  
BOTTOM  
( From Prescaler )  
Timer/Counter  
TCNTn  
=
=
0
OCnA  
(Int.Req.)  
Waveform  
Generation  
OCnA  
OCnB  
=
OCRnA  
Fixed  
TOP  
Value  
OCnB  
(Int.Req.)  
Waveform  
Generation  
=
OCRnB  
TCCRnA  
TCCRnB  
141  
2545M–AVR–09/07  
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