參數(shù)資料
型號(hào)： MR83C154XXX-20P883
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44
封裝： LCC-44
文件頁(yè)數(shù)： 5/46頁(yè)
文件大小： 7004K
代理商： MR83C154XXX-20P883
137
7593L–AVR–09/12
AT90USB64/128
When the OCnA, OCnB or OCnC is connected to the pin, the function of the COMnx1:0 bits is
dependent of the WGMn3:0 bits setting. Table 15-1 shows the COMnx1:0 bit functionality when
the WGMn3:0 bits are set to a normal or a CTC mode (non-PWM).
Table 15-2 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the fast
PWM mode.
Note:
A special case occurs when OCRnA/OCRnB/OCRnC equals TOP and
COMnA1/COMnB1/COMnC1 is set. In this case the compare match is ignored, but the set or clear
is done at TOP. See “Fast PWM mode” on page 104. for more details.
Table 15-3 on page 138 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to
the phase correct and frequency correct PWM mode.
Table 15-1.
Compare Output mode, non-PWM.
COMnA1/COMnB1/
COMnC1
COMnA0/COMnB0/
COMnC0
Description
00
Normal port operation, OCnA/OCnB/OCnC
disconnected.
0
1
Toggle OCnA/OCnB/OCnC on compare match.
10
Clear OCnA/OCnB/OCnC on compare match (set
output to low level).
11
Set OCnA/OCnB/OCnC on compare match (set
output to high level).
Table 15-2.
Compare Output mode, fast PWM.
COMnA1/COMnB1/
COMnC0
COMnA0/COMnB0/
COMnC0
Description
00
Normal port operation, OCnA/OCnB/OCnC
disconnected.
01
WGM13:0 = 14 or 15: Toggle OC1A on Compare
Match, OC1B and OC1C disconnected (normal port
operation). For all other WGM1 settings, normal port
operation, OC1A/OC1B/OC1C disconnected.
10
Clear OCnA/OCnB/OCnC on compare match, set
OCnA/OCnB/OCnC at TOP
11
Set OCnA/OCnB/OCnC on compare match, clear
OCnA/OCnB/OCnC at TOP
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