Rainbow-electronics ATmega32L Bedienungsanleitung PDF herunterladen (Seite 129)

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ATmega32(L)

2503C–AVR–10/02

For Timer/Counter2, the possible prescaled selections are: clk

T2S

/8, clk

T2S

/32, clk

T2S

/64,

clk

T2S

/128, clk

T2S

/256, and clk

T2S

/1024. Additionally, clk

T2S

as well as 0 (stop) may be

selected. Setting the PSR2 bit in SFIOR resets the prescaler. This allows the user to

operate with a predictable prescaler.

Special Function IO Register –

SFIOR

• Bit 1 – PSR2: Prescaler Reset Timer/Counter2

When this bit is written to one, the Timer/Counter2 prescaler will be reset. The bit will be

cleared by hardware after the operation is performed. Writing a zero to this bit will have

no effect. This bit will always be read as zero if Timer/Counter2 is clocked by the internal

CPU clock. If this bit is written when Timer/Counter2 is operating in asynchronous

mode, the bit will remain one until the prescaler has been reset.

Bit 7 6 5 4 3 2 1 0

ADTS2 ADTS1 ADTS0 – ACME PUD PSR2 PSR10 SFIOR

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

Initial Value 0 0 0 0 0 0 0 0

1 2 ... 124 125 126 127 128 129 130 131 132 133 134 ... 312 313

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