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ATmega325P 데이터시트(PDF) 128 Page - ATMEL Corporation

부품명 ATmega325P
상세설명  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  364 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega325P 데이터시트(HTML) 128 Page - ATMEL Corporation

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8023F–AVR–07/09
ATmega325P/3250P
Figure 15-13. Timer/Counter Timing Diagram, with Prescaler (f
clk_I/O/8)
15.11 Register Description
15.11.1
TCCR1A – Timer/Counter1 Control Register A
• Bit 7:6 – COM1A1:0: Compare Output Mode for Unit A
• Bit 5:4 – COM1B1:0: Compare Output Mode for Unit B
The COM1A1:0 and COM1B1:0 control the Output Compare pins (OC1A and OC1B respec-
tively) behavior. If one or both of the COM1A1:0 bits are written to one, the OC1A output
overrides the normal port functionality of the I/O pin it is connected to. If one or both of the
COM1B1:0 bit are written to one, the OC1B 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 OC1A or OC1B pin must be set in order to enable the output driver.
When the OC1A or OC1B is connected to the pin, the function of the COM1x1:0 bits is depen-
dent of the WGM13:0 bits setting. Table 15-2 shows the COM1x1:0 bit functionality when the
WGM13:0 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
(0x80)
COM1A1
COM1A0
COM1B1
COM1B0
–
–
WGM11
WGM10
TCCR1A
Read/Write
R/W
R/W
R/W
R/W
R
R
R/W
R/W
Initial Value
0
0
0
0
0000
Table 15-2.
Compare Output Mode, non-PWM
COM1A1/COM1B1
COM1A0/COM1B0
Description
0
0
Normal port operation, OC1A/OC1B disconnected.
0
1
Toggle OC1A/OC1B on Compare Match.
10
Clear OC1A/OC1B on Compare Match (Set output to
low level).
11
Set OC1A/OC1B on Compare Match (Set output to
high level).



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