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| MC68HC12 Datasheet, PDF (213/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit | |||
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Oscillator
MC68HC912Dx128P Pierce Oscillator Specification
CFLT
2
RFLT
-
OTA
+
BUF
-
ALC
+
BIAS
RFEEDBACK
EN
GM
RESD
EXTAL
Resonator
XTAL
CEX-VSS
CX-VSS
Figure 13-4. MC68HC912Dx128P Pierce Oscillator Architecture
There are the following primary differences between the previous
Colpitts (âAâ) and new Pierce (âPâ) oscillator configurations:
⢠Oscillator architecture was changed from Colpitts to Pierce.
⢠Hysteresis was added to the clock input buffer to reduce sensitivity
to noise.
⢠The bias current to the amplifier was optimized for less process
variation.
MC68HC912DT128A â Rev 4.0
MOTOROLA
Oscillator
Technical Data
213
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