clk_I/O
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉锛� ATMEGA164PA-MCHR
寤犲晢锛� Atmel
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鏂囦欢澶у皬锛� 0K
鎻忚堪锛� MCU AVR 16KB FLASH 20MHZ 44-VQFN
鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� megaAVR Introduction
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绯诲垪锛� AVR® ATmega
鏍稿績铏曠悊鍣細 AVR
鑺珨灏哄锛� 8-浣�
閫熷害锛� 20MHz
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EEPROM 澶у皬锛� 512 x 8
RAM 瀹归噺锛� 1K x 8
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 1.8 V ~ 5.5 V
鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� A/D 8x10b
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灏佽/澶栨锛� 44-VQFN 瑁搁湶鐒婄洡
鍖呰锛� 鍓垏甯� (CT)
鍏跺畠鍚嶇ū锛� ATMEGA164PA-MCHRCT
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133
8272E鈥揂VR鈥�04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
Figure 16-13. Timer/Counter Timing diagram, with prescaler (f
clk_I/O/8).
16.12 Register description
16.12.1
TCCRnA 鈥� Timer/Counter n Control Register A
Bit 7:6 鈥� COMnA1:0: Compare Output Mode for Channel A
Bit 5:4 鈥� COMnB1:0: Compare Output Mode for Channel B
The COMnA1:0 and COMnB1:0 control the Output Compare pins (OCnA and OCnB respec-
tively) behavior. If one or both of the COMnA1:0 bits are written to one, the OCnA output
overrides the normal port functionality of the I/O pin it is connected to. If one or both of the
COMnB1:0 bit are written to one, the OCnB output overrides the normal port functionality of the
I/O pin it is connected to. However, note that the Data Direction Register (DDR) bit correspond-
ing to the OCnA or OCnB pin must be set in order to enable the output driver.
When the OCnA or OCnB is connected to the pin, the function of the COMnx1:0 bits is depen-
dent of the WGMn3:0 bits setting. Table 16-2 on page 133 shows the COMnx1:0 bit functionality
when the WGMn3:0 bits are set to a Normal or a CTC mode (non-PWM).
TOVn(FPWM)
and ICF n(if used
as TOP)
OCRnx
(Update at TOP)
TCNTn
(CTC and FPWM)
TCNTn
(PC and PFC PWM)
TOP - 1
TOP
TOP - 1
TOP - 2
Old OCRnx Value
New OCRnx Value
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O/8)
Bit
7
6
5
4
3210
COMnA1
COMnA0
COMnB1
COMnB0
鈥�
WGMn1
WGMn0
TCCRnA
Read/Write
R/W
R
R/W
Initial Value
0
0000
Table 16-2.
Compare Output mode, non-PWM.
COMnA1/COMnB1
COMnA0/COMnB0
Description
0
Normal port operation, OCnA/OCnB disconnected.
0
1
Toggle OCnA/OCnB on Compare Match.
10
Clear OCnA/OCnB on Compare Match (Set output to
low level).
11
Set OCnA/OCnB on Compare Match (Set output to
high level).
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ATMEGA164PA-MNR 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU AVR 16KB FL 512B EE 1KB SRAM 20 MHZ GRN RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT
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