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AT90LS4433-4AI Datasheet(PDF) 35 Page - ATMEL Corporation |
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AT90LS4433-4AI Datasheet(HTML) 35 Page - ATMEL Corporation |
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35 / 126 page  35 AT90S/LS4433 1042H–AVR–04/03 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 7654 321 0 $32 ($52) MSB LSB TCNT0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0000 000 0 T1 |
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