Rainbow-electronics ATmega162V Uživatelský manuál stáhnout pdf (Strana 131)

131

ATmega162/V

2513E–AVR–09/03

• Bit 2:0 – CSn2:0: Clock Select

The three Clock Select bits select the clock source to be used by the Timer/Counter, see

Figure 55 and Figure 56.

If external pin modes are used for the Timer/Counter1, transitions on the T1 pin will

clock the counter even if the pin is configured as an output. This feature allows software

control of the counting..

Table 57. Clock Select Bit Description Timer/Counter1

CS12 CS11 CS10 Description

0 0 0 No clock source. (Timer/Counter stopped).

001clk

I/O

/1 (No prescaling)

010clk

I/O

/8 (From prescaler)

011clk

I/O

/64 (From prescaler)

100clk

I/O

/256 (From prescaler)

101clk

I/O

/1024 (From prescaler)

1 1 0 External clock source on T1 pin. Clock on falling edge.

1 1 1 External clock source on T1 pin. Clock on rising edge.

Table 58. Clock Select Bit Description Timer/Counter3

CS32 CS31 CS30

Description

0 0 0 No clock source. (Timer/Counter stopped).

001clk

I/O

/ 1 (No prescaling)

010clk

I/O

/ 8 (From prescaler).

011clk

I/O

/ 64 (From prescaler).

100clk

I/O

/ 256 (From prescaler).

101clk

I/O

/ 1024 (From prescaler).

110clk

I/O

/ 16 (From prescaler).

111clk

I/O

/ 32 (From prescaler).

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 322 323

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