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AT90S4433 Datasheet(PDF) 35 Page - ATMEL Corporation

Part No. AT90S4433
Description  8-Bit AVR Microcontroller with 4K Bytes of In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S4433 Datasheet(HTML) 35 Page - ATMEL Corporation

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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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