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AT90USB646 Datasheet(PDF) 136 Page - ATMEL Corporation

Part # AT90USB646
Description  8-bit Atmel Microcontroller with 64/128Kbytes of ISP Flash and USB Controller
PDF  456 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 136 Page - ATMEL Corporation

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7593L–AVR–09/12
AT90USB64/128
Figure 15-13. Timer/Counter timing diagram, with prescaler (f
clk_I/O/8).
15.10 16-bit Timer/Counter register description
15.10.1
TCCR1A – Timer/Counter1 Control Register A
15.10.2
TCCR3A – Timer/Counter3 Control Register A
• Bit 7:6 – COMnA1:0: Compare Output Mode for Channel A
• Bit 5:4 – COMnB1:0: Compare Output Mode for Channel B
• Bit 3:2 – COMnC1:0: Compare Output Mode for Channel C
The COMnA1:0, COMnB1:0, and COMnC1:0 control the output compare pins (OCnA, OCnB,
and OCnC respectively) 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 bits are written to one, the OCnB output overrides the normal port func-
tionality of the I/O pin it is connected to. If one or both of the COMnC1:0 bits are written to one,
the OCnC output overrides the normal port functionality of the I/O pin it is connected to. How-
ever, note that the Data Direction Register (DDR) bit corresponding to the OCnA, OCnB or
OCnC pin must be set in order to enable the output driver.
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
65
43
2
1
0
COM1A1
COM1A0
COM1B1
COM1B0
COM1C1
COM1C0
WGM11
WGM10
TCCR1A
Read/write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value
00
00
000
0
Bit
7
65
43
2
1
0
COM3A1
COM3A0
COM3B1
COM3B0
COM3C1
COM3C0
WGM31
WGM30
TCCR3A
Read/write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value
00
00
000
0



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