ATmega64A datasheet(133/392 Pages) ATMEL

133 / 392 page

133

8160C–AVR–07/09

ATmega64A

15.11 16-bit Timer/Counter Register Description

15.11.1

TCCR1A –Timer/Counter1 Control Register A

15.11.2

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.

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 15-2 shows the COMnx1:0 bit functionality when

the WGMn3:0 bits are set to a Normal or a CTC mode (non-PWM).

Bit

543

0x2F (0x4F)

COM1A1

COM1A0

COM1B1

COM1B0

COM1C1

COM1C0

WGM11

WGM10

TCCR1A

Read/Write

R/W

Initial Value

Bit

(0x8B)

COM3A1

COM3A0

COM3B1

COM3B0

COM3C1

COM3C0

WGM31

WGM30

TCCR3A

Read/Write

R/W

Initial Value

Table 15-2.

Compare Output Mode, non-PWM

COMnA1/

COMnB1/

COMnC1

COMnA0/

COMnB0/

COMnC0

Description

Normal port operation, OCnA/OCnB/OCnC disconnected.

Toggle OCnA/OCnB/OCnC on Compare Match.

Clear OCnA/OCnB/OCnC on Compare Match (Set output to low

level).

Set OCnA/OCnB/OCnC on Compare Match (Set output to high

level).

ATmega64A bảng dữ liệu(PDF) 133 Page - ATMEL Corporation

ATmega64A bảng dữ liệu(HTML) 133 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL