ATmega16U4 datasheet(167/408 Pages) ATMEL

167 / 408 page

167

7766D–AVR–01/09

ATmega16U4/ATmega32U4

• Bits 3 .. 0 - CS43, CS42, CS41, CS40: Clock Select Bits 3, 2, 1, and 0

The Clock Select bits 3, 2, 1, and 0 define the prescaling source of Timer/Counter4.

The Stop condition provides a Timer Enable/Disable function.

15.12.3

TCCR4C – Timer/Counter4 Control Register C

• Bits 7,6 - COM4A1S, COM4A0S: Comparator A Output Mode, Bits 1 and 0

These bits are the shadow bits of the COM4A1 and COM4A0 bits that are described in the sec-

tion “TCCR4A – Timer/Counter4 Control Register A” on page 163.

Table 15-14. Division factors of the Dead Time prescaler

DTPS41

DTPS40

Prescaler divides the T/C4 clock by

1x (no division)

012x

104x

118x

Table 15-15. Timer/Counter4 Prescaler Select

CS43

CS42

CS41

CS40

Asynchronous Clocking Mode

Synchronous Clocking Mode

0000T/C4 stopped

T/C4 stopped

0001PCK

0010PCK/2

CK/2

0011PCK/4

CK/4

0100PCK/8

CK/8

0101PCK/16

CK/16

0110PCK/32

CK/32

0111PCK/64

CK/64

1000PCK/128

CK/128

1001PCK/256

CK/256

1010PCK/512

CK/512

1011PCK/1024

CK/1024

1100PCK/2048

CK/2048

1101PCK/4096

CK/4096

1110PCK/8192

CK/8192

1111PCK/16384

CK/16384

Bit

76543210

COM4A1S

COM4A0S

COM4B1S COMAB0S

COM4D1

COM4D0

FOC4D

PWM4D

TCCR4C

Read/Write

R/W

Initial value

00000000

ATmega16U4 Datasheet(PDF) 167 Page - ATMEL Corporation

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