clk_I/O
參數(shù)資料
型號: ATMEGA1284-PU
廠商: Atmel
文件頁數(shù): 39/160頁
文件大小: 0K
描述: IC MCU AVR 128K FLASH 40PDIP
產品培訓模塊: 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
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 128KB(64K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 4K x 8
RAM 容量: 16K x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
數(shù)據轉換器: A/D 8x10b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
配用: ATSTK600-RC05-ND - STK600 ROUTING CARD AVR
133
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
Figure 16-13. Timer/Counter Timing diagram, with prescaler (f
clk_I/O/8).
16.12 Register description
16.12.1
TCCRnA – Timer/Counter n Control Register A
Bit 7:6 – COMnA1:0: Compare Output Mode for Channel A
Bit 5:4 – COMnB1:0: Compare Output Mode for Channel B
The COMnA1:0 and COMnB1:0 control the Output Compare pins (OCnA and OCnB respec-
tively) behavior. If one or both of the COMnA1:0 bits are written to one, the OCnA output
overrides the normal port functionality of the I/O pin it is connected to. If one or both of the
COMnB1:0 bit are written to one, the OCnB output overrides the normal port functionality of the
I/O pin it is connected to. However, note that the Data Direction Register (DDR) bit correspond-
ing to the OCnA or OCnB pin must be set in order to enable the output driver.
When the OCnA or OCnB is connected to the pin, the function of the COMnx1:0 bits is depen-
dent of the WGMn3:0 bits setting. Table 16-2 on page 133 shows the COMnx1:0 bit functionality
when the WGMn3:0 bits are set to a Normal or a CTC mode (non-PWM).
TOVn(FPWM)
and ICF n(if used
as TOP)
OCRnx
(Update at TOP)
TCNTn
(CTC and FPWM)
TCNTn
(PC and PFC PWM)
TOP - 1
TOP
TOP - 1
TOP - 2
Old OCRnx Value
New OCRnx Value
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O/8)
Bit
7
6
5
4
3210
COMnA1
COMnA0
COMnB1
COMnB0
WGMn1
WGMn0
TCCRnA
Read/Write
R/W
R
R/W
Initial Value
0
0000
Table 16-2.
Compare Output mode, non-PWM.
COMnA1/COMnB1
COMnA0/COMnB0
Description
0
Normal port operation, OCnA/OCnB disconnected.
0
1
Toggle OCnA/OCnB on Compare Match.
10
Clear OCnA/OCnB on Compare Match (Set output to
low level).
11
Set OCnA/OCnB on Compare Match (Set output to
high level).
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