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MEGA128CAN 参数 Datasheet PDF下载

MEGA128CAN图片预览
型号: MEGA128CAN
PDF下载: 下载PDF文件 查看货源
内容描述: 微控制器,带有ISP功能的Flash和CAN控制器128K字节 [Microcontroller WITH 128K BYTES OF ISP FLASH AND CAN CONTROLLER]
分类和应用: 微控制器
文件页数/大小: 413 页 / 5507 K
品牌: ATMEL [ ATMEL ]
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• Bit 6, 3 – WGM21:0: Waveform Generation Mode  
These bits control the counting sequence of the counter, the source for the maximum  
(TOP) counter value, and what type of waveform generation to be used. Modes of oper-  
ation supported by the Timer/Counter unit are: Normal mode, Clear Timer on Compare  
match (CTC) mode, and two types of Pulse Width Modulation (PWM) modes. See Table  
66 and “Modes of Operation” on page 145.  
Table 66. Waveform Generation Mode Bit Description(1)  
WGM21 WGM20 Timer/Counter Mode  
Update of TOV2 Flag  
OCR2A at Set on  
Mode  
(CTC2)  
(PWM2) of Operation  
TOP  
0xFF  
0xFF  
0
1
2
3
0
0
1
1
0
1
0
1
Normal  
Immediate MAX  
PWM, Phase Correct  
CTC  
TOP  
BOTTOM  
OCR2A Immediate MAX  
0xFF TOP MAX  
Fast PWM  
Note:  
1. The CTC2 and PWM2 bit definition names are now obsolete. Use the WGM21:0 def-  
initions. However, the functionality and location of these bits are compatible with  
previous versions of the timer.  
• Bit 5:4 – COM2A1:0: Compare Match Output Mode A  
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 cor-  
responding to 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  
WGM21:0 bit setting. Table 67 shows the COM2A1:0 bit functionality when the  
WGM21:0 bits are set to a normal or CTC mode (non-PWM).  
Table 67. Compare Output Mode, non-PWM Mode  
COM2A1  
COM2A0  
Description  
0
0
1
1
0
1
0
1
Normal port operation, OC2A disconnected.  
Toggle OC2A on compare match.  
Clear OC2A on compare match.  
Set OC2A on compare match.  
Table 68 shows the COM2A1:0 bit functionality when the WGM21:0 bits are set to fast  
PWM mode.  
Table 68. Compare Output Mode, Fast PWM Mode(1)  
COM2A1  
COM2A0  
Description  
0
0
1
0
1
0
Normal port operation, OC2A disconnected.  
Reserved  
Clear OC2A on compare match.  
Set OC2A at TOP.  
1
1
Set OC2A on compare match.  
Clear OC2A at TOP.  
152  
AT90CAN128  
4250E–CAN–12/04  
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