20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 214
20-668-0011
Manufacturer Part Number
20-668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 20-668-0011
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Data Bus Width
8 bit
Maximum Clock Frequency
55.5 MHz
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 55 C
Number Of Programmable I/os
56
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
316-1061
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
20-668-0011
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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Depending on the application, the processor can continue executing code normally when
the main oscillator is divided down to a lower value. However, when the processor clock
is running off the 32 kHz clock, it is recommended that the Rabbit 3000 be performing a
tight polling loop, waiting for a wakeup event.
25.2.3 Short Chip Selects
When running at a reduced clock speed, it is likely that the chip selects for external
devices will not need to be active for an entire clock cycle. By reducing the width of the
chip select, the power consumption of the memory chip can be reduced without having
any affect on the processor itself.
For reduced processor speeds based on the main oscillator, a short chip select can be
enabled in GPSCR (this feature is not available when the processor is running at full
speed). This feature can be enabled separately for both reads and writes. When enabled,
the chip select signals will be the width of two undivided clocks and located at the end of
the transaction. The read data in the figures below is sampled by the rising edge of CLKI
that terminated the T2 cycle. Wait states are inserted between T1 and T2 so they do not
affect the width of the strobe.
204
Rabbit 3000 Microprocessor User’s Manual
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