參數(shù)資料
型號: ATMEGA644PA-MUR
廠商: Atmel
文件頁數(shù): 42/160頁
文件大小: 0K
描述: IC MCU AVR 64K FLASH 44VQFN
產(chǎn)品培訓模塊: MCU Product Line Introduction
megaAVR Introduction
標準包裝: 4,000
系列: AVR® ATmega
核心處理器: AVR
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 64KB(32K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 4K x 8
電壓 - 電源 (Vcc/Vdd): 1.8 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 ~ 85°C
封裝/外殼: 44-VFQFN 裸露焊盤
包裝: 帶卷 (TR)
其它名稱: ATMEGA644PA-MUR-ND
ATMEGA644PA-MURTR
136
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
When the ICRn is used as TOP value (see description of the WGMn3:0 bits located in the
TCCRnA and the TCCRnB Register), the ICPn is disconnected and consequently the Input Cap-
ture function is disabled.
Bit 5 – Reserved
This bit is reserved for future use. For ensuring compatibility with future devices, this bit must be
written to zero when TCCRnB is written.
Bit 4:3 – WGMn3:2: Waveform Generation Mode
Bit 2:0 – CSn2:0: Clock Select
The three Clock Select bits select the clock source to be used by the Timer/Counter, see Figure
If external pin modes are used for the Timer/Countern, transitions on the Tn pin will clock the
counter even if the pin is configured as an output. This feature allows software control of the
counting.
16.12.3
TCCRnC – Timer/Counter n Control Register C
Bit 7 – FOCnA: Force Output Compare for Channel A
Bit 6 – FOCnB: Force Output Compare for Channel B
The FOCnA/FOCnB bits are only active when the WGMn3:0 bits specifies a non-PWM mode.
However, for ensuring compatibility with future devices, these bits must be set to zero when
TCCRnA is written when operating in a PWM mode. When writing a logical one to the
FOCnA/FOCnB bit, an immediate compare match is forced on the Waveform Generation unit.
The OCnA/OCnB output is changed according to its COMnx1:0 bits setting. Note that the
FOCnA/FOCnB bits are implemented as strobes. Therefore it is the value present in the
COMnx1:0 bits that determine the effect of the forced compare.
Table 16-6.
Clock Select bit description.
CSn2
CSn1
CSn0
Description
0
No clock source (Timer/Counter stopped).
001
clkI/O/1 (No prescaling)
010
clk
I/O/8 (From prescaler)
011
clkI/O/64 (From prescaler)
100
clkI/O/256 (From prescaler)
101
clk
I/O/1024 (From prescaler)
1
0
External clock source on Tn pin. Clock on falling edge.
1
External clock source on Tn pin. Clock on rising edge.
Bit
765
4
3
2
1
0
FOCnA
FOCnB
TCCRnC
Read/Write
R/W
R
Initial Value000
0
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