参数资料
型号: MR80C32-20/883:D
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 20 MHz, MICROCONTROLLER, CQCC44
封装: LCC-44
文件页数: 65/103页
文件大小: 25028K
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).
相关PDF资料
PDF描述
MR80C32-36:RD 8-BIT, 36 MHz, MICROCONTROLLER, CQCC44
MQ80C32E-30/883:RD 8-BIT, 30 MHz, MICROCONTROLLER, CQFP44
MC80C32E-36/883 8-BIT, 36 MHz, MICROCONTROLLER, CDIP40
MC80C52TXXX-36/883:D 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CDIP40
MD80C52TXXX-30SHXXX:D 8-BIT, MROM, 30 MHz, MICROCONTROLLER, CDIP40
相关代理商/技术参数
参数描述
MR80C32-25 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
MR80C32-30 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
MR80C32-36 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
MR80C51BH 制造商:ROCHESTER 制造商全称:ROCHESTER 功能描述:CMOS SINGLE - CHIP 8-BIT MICROCOMPUTER 64K program Memory Space
MR80C86 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor