AT43USB353M datasheet(39/95 Pages) ATMEL

39 / 95 page

AT43USB353M

3307B–USB–4/04

Timer/Counter1 Control Register A – TCCR1A

• Bits 7, 6

– COM1A1, COM1A0: Compare Output Mode1A, Bits 1 and 0

The COM1A1 and COM1A0 control bits determine any output pin action following a compare

match in Timer/Counter1. Any output pin actions affect pin OC1A (Output CompareA) pin 1.

This is an alternative function to an I/O port and the corresponding direction control bit must be

set (one) to control the output pin. The control configuration is shown in Table 14.

• Bits 5, 4

– COM1B1, COM1B0: Compare Output Mode1B, Bits 1 and 0

The COM1B1 and COM1B0 control bits determine any output pin action following a compare

match in Timer/Counter1. Any output pin actions affect pin OC1B (Output CompareB). The fol-

lowing control configuration is given:

Note:

1. X = A or B

2. In PWM mode, these bits have a different function. Refer to Table 18 for a detailed

description.

• Bits 3..2

– Res: Reserved Bits

These bits are reserved bits in the AT43USB353M and always read zero.

• Bits 1..0

– PWM11, PWM10: Pulse Width Modulator Select Bits 1 and 0

These bits select PWM operation of Timer/Counter1 as specified in Table 15.

Bit

$2F ($4F)

COM1A1

COM1A0

COM1B1

COM1B0

–

PWM11

PWM10

TCCR1A

Read/Write

R/W

Initial Value

Table 14. Compare 1 Mode Select

(2)

COM1X1

COM1X0

Description

Timer/Counter1 disconnected from output pin OC1X.

(1)

Toggle the OC1X output line.

(1)

Clear the OC1X output line (to zero).

(1)

Set the OC1X output line (to one).

(1)

Table 15. PWM Mode Select

PWM11

PWM10

Description

PWM operation of Timer/Counter1 is disabled.

Timer/Counter1 is an 8-bit PWM.

Timer/Counter1 is a 9-bit PWM.

Timer/Counter1 is a 10-bit PWM.

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