參數(shù)資料
型號: ATTINY43U-SU
廠商: Atmel
文件頁數(shù): 151/158頁
文件大小: 0K
描述: MCU AVR 4K FLASH 8MHZ 20-SOIC
產(chǎn)品培訓(xùn)模塊: ATtiny43U Overview
MCU Product Line Introduction
tinyAVR Introduction
標準包裝: 37
系列: AVR® ATtiny
核心處理器: AVR
芯體尺寸: 8-位
速度: 8MHz
連通性: USI
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,溫度傳感器,WDT
輸入/輸出數(shù): 16
程序存儲器容量: 4KB(2K x 16)
程序存儲器類型: 閃存
EEPROM 大小: 64 x 8
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 管件
產(chǎn)品目錄頁面: 613 (CN2011-ZH PDF)
配用: ATSTK600-TINYX3U-ND - STK600 SOCKET/ADAPTER TINYX3U
92
8048C–AVR–02/12
ATtiny43U
12.9
Register Description
12.9.1
TCCR0A – Timer/Counter Control Register A
12.9.2
TCCR1A – Timer/Counter Control Register A
Bits 7:6 – COMnA[1:0]: Compare Match Output A Mode
These bits control the Output Compare pin (OCnA) behavior. If one or both of the COMnA[1:0]
bits are set, the OCnA 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 OCnA pin
must be set in order to enable the output driver.
When OCnA is connected to the pin, the function of the COMnA[1:0] bits depends on the
WGMn[2:0] bit setting. Table 12-2 on page 92 shows the COMnA[1:0] bit functionality when the
WGMn[2:0] bits are set to a normal or CTC mode (non-PWM).
Table 12-3 on page 92 shows the COMnA[1:0] bit functionality when the WGMn[1:0] bits are set
to fast PWM mode.
Note:
1. A special case occurs when OCRnA equals TOP and COMnA1 is set. In this case, the Com-
pare Match is ignored, but the set or clear is done at TOP. See “Fast PWM Mode” on page 86
for more details.
Bit
7
6
5
4
3
2
1
0
COM0A1
COM0A0
COM0B1
COM0B0
WGM01
WGM00
TCCR0A
Read/Write
R/W
R
R/W
Initial Value
0
Bit
7
6
5
4
3
2
1
0
COM1A1
COM1A0
COM1B1
COM1B0
WGM11
WGM10
TCCR1A
Read/Write
R/W
R
R/W
Initial Value
0
Table 12-2.
Compare Output Mode, non-PWM Mode
COMnA1
COMnA0
Description
0
Normal port operation, OCnA disconnected.
0
1
Toggle OCnA on Compare Match
1
0
Clear OCnA on Compare Match
1
Set OCnA on Compare Match
Table 12-3.
Compare Output Mode, Fast PWM Mode
COMnA1
COMnA0
Description
0
Normal port operation, OCnA disconnected.
01
WGMn2 = 0: Normal Port Operation, OCnA Disconnected.
WGMn2 = 1: Toggle OCnA on Compare Match.
1
0
Clear OCnA on Compare Match, set OCnA at TOP
1
Set OCnA on Compare Match, clear OCnA at TOP
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