参数资料
型号: ATMEGA164A-MCH
厂商: Atmel
文件页数: 66/160页
文件大小: 0K
描述: IC MCU AVR 16K 20MHZ 44QFN
产品培训模块: MCU Product Line Introduction
megaAVR Introduction
标准包装: 490
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 16KB(8K x 16)
程序存储器类型: 闪存
EEPROM 大小: 512 x 8
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-VQFN 裸露焊盘
包装: 托盘
158
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
Table 17-4 shows the COM2A1:0 bit functionality when the WGM22:0 bits are set to phase cor-
rect 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 TOP. See ”Phase Correct PWM mode” on
page 151 for more details.
Bits 5:4 – COM2B1:0: Compare Match Output B Mode
These bits control the Output Compare pin (OC2B) behavior. If one or both of the COM2B1:0
bits are set, the OC2B 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 OC2B pin
must be set in order to enable the output driver.
When OC2B is connected to the pin, the function of the COM2B1:0 bits depends on the
WGM22:0 bit setting. Table 17-5 shows the COM2B1:0 bit functionality when the WGM22:0 bits
are set to a normal or CTC mode (non-PWM).
Table 17-6 shows the COM2B1:0 bit functionality when the WGM22:0 bits are set to fast PWM
mode.
Table 17-4.
Compare Output mode, phase correct PWM mode (1).
COM2A1
COM2A0
Description
0
Normal port operation, OC2A disconnected.
01
WGM22 = 0: Normal Port Operation, OC2A Disconnected.
WGM22 = 1: Toggle OC2A on Compare Match.
10
Clear OC2A on Compare Match when up-counting. Set OC2A on
Compare Match when down-counting.
11
Set OC2A on Compare Match when up-counting. Clear OC2A on
Compare Match when down-counting.
Table 17-5.
Compare Output mode, non-PWM mode.
COM2B1
COM2B0
Description
0
Normal port operation, OC2B disconnected.
0
1
Toggle OC2B on Compare Match
1
0
Clear OC2B on Compare Match
1
Set OC2B on Compare Match
Table 17-6.
Compare Output mode, fast PWM mode
COM2B1
COM2B0
Description
0
Normal port operation, OC2B disconnected.
01
Reserved
10
Clear OC2B on Compare Match, set OC2B at BOTTOM,
(non-inverting mode).
11
Set OC2B on Compare Match, clear OC2B at BOTTOM,
(inverting mode).
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