668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 80
![no-image](/images/no-image-200.jpg)
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
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
668-0003-C
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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7.3 Clock Doubler
The clock doubler is provided to allow a lower frequency crystal to be used for the main
oscillator and to provide an added range of clock frequency adjustability. The clock dou-
bler is controlled via the Global Clock Double Register as shown in Table 7-2.
Table 7-3 lists the recommended values or “settings” for the Global Clock Double Register
for various oscillator frequencies.
74
7:3
2:0
Bit(s)
Table 7-3. Recommended Delays Set In GCDR for Clock Doubler
Table 7-2. Global Clock Double Register (GCDR, adr = 0x0F)
xxxxx
000
001
010
011
100
101
110
111
Value
Recommended GCDR Value
These bits are ignored.
The clock double circuit is disabled.
10 ns nominal low time.
12 ns nominal low time.
14 ns nominal low time.
16 ns nominal low time.
18 ns nominal low time.
20 ns nominal low time.
8 ns nominal low time.
7
6
5
4
3
2
1
0
12.9024–14.7576 MHz
14.7576–16.5888 MHz
16.5888–20.2752 MHz
20.2752–23.9616 MHz
23.9616–31.3344 MHz
11.0592–12.9024 MHz
Description
Frequency Range
Rabbit 2000 Microprocessor User’s Manual
≤11.0592 MHz
>31.3344 MHz
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