Rainbow-electronics AT90LS4433 Manual de usuario descargar pdf (Pagina 37)

AT90S/LS4433

1042G–AVR–09/02

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 7 6 5 4 3 2 1 0

$2F ($4F) COM11 COM10 ––––PWM11 PWM10 TCCR1A

Read/Write R/W R/W R R R R R/W R/W

Initial Value 0 0 0 0 0 0 0 0

Table 10. Compare 1 Mode Select

COM11 COM10 Description

0 0 Timer/Counter1 disconnected from output pin OC1

0 1 Toggle the OC1 output line.

1 0 Clear the OC1 output line (to zero).

1 1 Set the OC1 output line (to one).

Table 11. PWM Mode Select

PWM11 PWM10 Description

0 0 PWM operation of Timer/Counter1 is disabled

0 1 Timer/Counter1 is an 8-bit PWM

1 0 Timer/Counter1 is a 9-bit PWM

1 1 Timer/Counter1 is a 10-bit PWM

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 124 125

Sin comentarios

Rainbow-electronics AT90LS4433 Manual de usuario Pagina 37