AT90LS4433-4AI datasheet(37/126 Pages) ATMEL

37 / 126 page

AT90S/LS4433

1042H–AVR–04/03

Timer/Counter1 Control

• Bits 7, 6 – COM11, COM10: Compare Output Mode1, Bits 1, and 0

The COM11 and COM10 control bits determine any output pin action following a

Compare Match in Timer/Counter1. Any output pin actions affect pin OC1 (Output

Compare pin 1). This is an alternative function to an I/O port, and the corresponding

direction control bit must be set (one) to control an output pin. The control configuration

is shown in Table 10.

In PWM mode, these bits have a different function. Refer to Table 11 for a detailed

description.

• Bits 5..2 – Res: Reserved Bits

These bits are reserved bits in the AT90S4433 and always read as zero.

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

These bits select PWM operation of Timer/Counter1 as specified in Table 11. This mode

is described on page 41.

Bit

$2F ($4F)

COM11

COM10

–

PWM11

PWM10

TCCR1A

Read/Write

R/W

Initial Value

Table 10. Compare 1 Mode Select

COM11

COM10

Description

Timer/Counter1 disconnected from output pin OC1

Toggle the OC1 output line.

Clear the OC1 output line (to zero).

Set the OC1 output line (to one).

Table 11. 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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