MC912DG128ACPVE Datasheet, PDF (213/478 Pages) Freescale Semiconductor, Inc – Upward compatible with M68HC11 instruction set

Freescale Semiconductor, Inc.
Oscillator
MC68HC912Dx128P Pierce Oscillator Specification
CFLT
2
RFLT
-
OTA
+
BUF
-
ALC
+
BIAS
RFEEDBACK
EN
GM
RESD
EXTAL
Resonator
XTAL
C_EX-VSS
C_X-VSS
Figure 13-4. MC68HC912Dx128P Pierce Oscillator Architecture
There are the following primary differences between the previous
Colpitts (‘A’) and new Pierce (‘P’) 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 — Rev 4.0
MOTOROLA
Oscillator
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Technical Data
213