mc68hc912d60c Freescale Semiconductor, Inc, mc68hc912d60c Datasheet - Page 195
mc68hc912d60c
Manufacturer Part Number
mc68hc912d60c
Description
Hc12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC912D60C.pdf
(460 pages)
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MC68HC912D60A — Rev. 3.1
Freescale Semiconductor
There are the following primary differences between the previous
Colpitts (‘A’) and new Pierce (‘P’) oscillator configurations:
•
•
•
Figure 12-4. MC68HC912D60P Pierce Oscillator Architecture
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.
CFLT
2
Oscillator
EXTAL
RFLT
MC68HC912D60P Pierce Oscillator Specification
RFEEDBACK
C
EX-VSS
+
-
+
-
RESD
OTA
ALC
Resonator
C
X-VSS
BIAS
EN
GM
BUF
XTAL
Technical Data
Oscillator
195
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