668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 213
668-0010
Manufacturer Part Number
668-0010
Description
IC MPU RABIT3000 55.5MHZ 128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0010
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
316-1016
- Current page: 213 of 312
- Download datasheet (2Mb)
25.2 Operation
25.2.1 Unused Pins
Input (or bidirectional) pins that are unused in a design can pick up noise that may cause
the transistors in the input buffer to switch states quickly, causing unnecessary current
draw. To avoid this, all unused pins should be connected to a weak pullup or pulldown
resistor (approximately 100 k) and left as inputs. This provides protection from noise
when the pin is an input, but also limits the current draw if the pin gets inadvertently
enabled as an output.
25.2.2 Clock Rates
The processor and peripheral clocks in the Rabbit 3000 can be run in six different modes
using the main oscillator: full speed; divided by 2, 4, 6, or 8; and the processor clock divided
by 8 with the peripheral clock at full speed. If the clock doubler is enabled, the options
also include twice the main oscillator frequency and the main oscillator divided by 3.
In addition, the 32 kHz clock can be used for the processor and peripheral clocks; the 32 kHz
clock can also be divided by 2, 4, 8, or 16, which provides dramatically lower power
consumption.
Table 25-1 lists the options for the clock modes and the processor clock frequency.
Chapter 25 Low-Power Operation
Full
Full
Divided by 2
Divided by 2
Divided by 4
Divided by 6
Divided by 4
Divided by 8
Divided by 6
Divided by 8
Off
used)
(32 kHz divider
Main Oscillator
GCSR Setting
Table 25-1. Clock Modes
Doubler
Clock
N/A
Off
Off
Off
Off
Off
On
On
On
On
On
Disabled
Divider
32 kHz
N/A
/ 16
/ 2
/ 4
/ 8
Processor Clock
2 × Main Oscillator
Main Oscillator / 2
Main Oscillator / 3
Main Oscillator / 4
Main Oscillator / 6
Main Oscillator / 8
Main Oscillator
Frequency
32.768 kHz
16.384 kHz
8.192 kHz
4.096 kHz
2.048 kHz
203
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