668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 23

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668-0011

Manufacturer Part Number
668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet

Specifications of 668-0011

Rohs Status
RoHS non-compliant
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
Features
-
Other names
316-1043

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
668-0011
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
2.3.3 Clock Doubler
The clock doubler allows a lower frequency crystal to be used for the main oscillator and
to provide an added range over which the clock frequency can be adjusted. The clock dou-
bler is controlled via the Global Clock Double Register (GCDR).
The clock doubler uses an on-chip delay circuit that must be programmed by the user at
startup if there is a need to double the clock. Table 2-3 lists the recommended delays for
the GCDR for various oscillator frequencies.
Chapter 2 Clocks
Table 2-3. Recommended Delays Set In GCDR for Clock Doubler
Recommended GCDR Value
0x000B
0x000F
0x0009
0x0006
0x0003
0x0000
11.0592–16.5888 MHz
16.5888–20.2752 MHz
20.2752–52.8384 MHz
7.3728–11.0592 MHz
Frequency Range
>52.8384 MHz
7.3728 MHz
13

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