Rainbow-electronics AT90LS4433 Manual do Utilizador descarregar pdf (Página 35)

AT90S/LS4433

1042G–AVR–09/02

The Stop condition provides a Timer Enable/Disable function. The prescaled CK modes

are scaled directly from the CK Oscillator clock. If the external pin modes are used for

Timer/Counter0, transitions on PD4/(T0) will clock the counter even if the pin is config-

ured as an output. This feature can give the user software control of the counting.

Timer Counter0 – TCNT0

The Timer/Counter0 is realized as an up-counter with read and write access. If the

Timer/Counter0 is written and a clock source is present, the Timer/Counter0 continues

counting in the clock cycle following the write operation.

16-bit Timer/Counter1 Figure 32 shows the block diagram for Timer/Counter1.

Figure 32. Timer/Counter1 Block Diagram

The 16-bit Timer/Counter1 can select clock source from CK, prescaled CK or an exter-

nal pin. In addition, it can be stopped as described in the specification for the

Timer/Counter1 Control Register (TCCR1A). The different Status Flags (Overflow, Com-

pare Match and Capture Event) and control signals are found in the Timer/Counter

Bit 76543210

$32 ($52) MSB LSB TCNT0

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

InitialValue00000000

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 124 125

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Rainbow-electronics AT90LS4433 Manual do Utilizador Página 35