參數(shù)資料
型號: ATMEGA644PA-PU
廠商: Atmel
文件頁數(shù): 65/160頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 64KB FLASH 40DIP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
megaAVR Introduction
標準包裝: 10
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(shè)備: 欠壓檢測/復(fù)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(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
產(chǎn)品目錄頁面: 614 (CN2011-ZH PDF)
配用: ATSTK600-RC05-ND - STK600 ROUTING CARD AVR
157
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
17.11 Register description
17.11.1
TCCR2A – Timer/Counter Control Register A
Bits 7:6 – COM2A1:0: Compare Match Output A Mode
These bits control the Output Compare pin (OC2A) behavior. If one or both of the COM2A1:0
bits are set, the OC2A output overrides the normal port functionality of the I/O pin it is connected
to. However, note that the Data Direction Register (DDR) bit corresponding to the OC2A pin
must be set in order to enable the output driver.
When OC2A is connected to the pin, the function of the COM2A1:0 bits depends on the
WGM22:0 bit setting. Table 17-2 shows the COM2A1:0 bit functionality when the WGM22:0 bits
are set to a normal or CTC mode (non-PWM).
Table 17-3 shows the COM2A1:0 bit functionality when the WGM21:0 bits are set to fast PWM
mode.
Note:
1. A special case occurs when OCR2A equals TOP and COM2A1 is set. In this case, the Com-
pare Match is ignored, but the set or clear is done at BOTTOM. See ”Fast PWM mode” on
page 149 for more details.
Bit
7
6
5
4
3
210
COM2A1
COM2A0
COM2B1
COM2B0
WGM21
WGM20
TCCR2A
Read/Write
R/W
R
R/W
Initial Value
0
Table 17-2.
Compare Output mode, non-PWM mode.
COM2A1
COM2A0
Description
0
Normal port operation, OC0A disconnected.
0
1
Toggle OC2A on Compare Match
1
0
Clear OC2A on Compare Match
1
Set OC2A on Compare Match
Table 17-3.
Compare Output mode, fast PWM mode
COM2A1
COM2A0
Description
0
Normal port operation, OC2A disconnected.
01
WGM22 = 0: Normal Port Operation, OC0A Disconnected.
WGM22 = 1: Toggle OC2A on Compare Match.
10
Clear OC2A on Compare Match, set OC2A at BOTTOM,
(non-inverting mode).
11
Set OC2A on Compare Match, clear OC2A at BOTTOM,
(inverting mode).
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