DM-COP8/44P National Semiconductor, DM-COP8/44P Datasheet - Page 29
DM-COP8/44P
Manufacturer Part Number
DM-COP8/44P
Description
CABLE FOR DEBUG MODULE 44-PLCC
Manufacturer
National Semiconductor
Datasheet
1.DM-COP820D.pdf
(254 pages)
Specifications of DM-COP8/44P
Accessory Type
44-PLCC Target Cable
For Use With/related Products
MetaLink Debug Module
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*DM-COP8/44P
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which is independent of power supply and temperature changes, low cost and usable at
any frequency. As compared with other oscillator circuits, this circuit is not disturbed
very much by connecting a scope probe at any point in the circuit, because it is a stable
circuit and has low impedance. This makes it easier to monitor the circuit without any
major disturbance. The Pierce oscillator has one disadvantage. The amplifier used in the
circuit must have high gain to compensate for gain losses in the circuitry surrounding
the crystal.
Figure 1-10 shows the classic phase shift oscillator found not only on the COP8SAx7 but
on most other microcontroller circuits. It is the simplest oscillator in terms of component
complexity.
The Pierce is a series resonant circuit. For oscillation to occur, two criteria must be met:
The amplifier (intergrated on-chip) provides the desired gain and the 180˚ phase shift.
The external C
resistor is used at lower frequencies (typically lower than 2.5 MHz) to introduce losses
around the loop and prevent the oscillator going into harmonic oscillation. The R
resistor is used to bias the amplifier for better and quicker oscillator start-up.
Inputs/Outputs
Inputs and Outputs allow the microcontroller to communicate with external devices.
Inputs
1. The loop gain must be greater than one.
2. The phase shift around the loop must be 360˚
1
and C
2
Figure 1-10 Phase Shift Oscillator
capacitors provide the additional 180˚ phase shift. The R
C
2
An outside device forces a microcontroller pin high or
low. The logic level is read by the microcontroller as a
single bit of incoming information.
PHASE SHIFT
CRYSTAL
+
R
(180 )
LOSS
2
AMPL.
GAIN A
-
MICROCONTROLLER BASICS
C
R
1
1
OUT
1-17
1
2
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