668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 124
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668-0003-C
Manufacturer Part Number
668-0003-C
Description
IC CPU RABBIT2000 30MHZ 100PQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0003.pdf
(228 pages)
Specifications of 668-0003-C
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 2000 8-Bit
Speed
30MHz
Voltage
2.7V, 3V, 3.3V, 5V
Mounting Type
Surface Mount
Package / Case
100-MQFP, 100-PQFP
Features
-
Other names
316-1004
668-0003
668-0003
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
668-0003-C
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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Timer B can be used for various purposes. The 10-bit counter can be read to record the
time at which an event takes place. If the event creates an interrupt, the timer can be read
in the interrupt routine. The known time of execution of the interrupt routine can be sub-
tracted. The variable interrupt latency is then the uncertainty in the event time. This can be
as little 19 clocks if the interrupt is the highest priority interrupt. If the system clock is 20
MHz, the counter can count as fast as 10 MHz. The uncertainty in a pulse width measure-
ment can be nearly as low as 38 clocks (2 x 19), or about 2 µs for a 20 MHz system clock.
Timer B can be used to change a parallel port output register at a particular specified time
in the future. A pulse train with edges at arbitrary times can be generated with the restric-
tion that two adjacent edges cannot be too close to each other since an interrupt must be
serviced after each edge to set up the time for the next edge. This restriction limits the
minimum pulse width to about 5 µs, depending on the clock speed and interrupt priorities.
118
Rabbit 2000 Microprocessor User’s Manual
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