MC912D60ACPVE8 Datasheet, PDF (175/460 Pages) Freescale Semiconductor, Inc – MC68HC912D60A MC68HC912D60C MC68HC912D60P Technical Data

Oscillator
Contents
Technical Data — MC68HC912D60A
Section 12. Oscillator
12.1 Contents
12.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
12.3 MC68HC912D60A Oscillator Specification. . . . . . . . . . . . . . . 176
12.4 MC68HC912D60C Colpitts Oscillator Specification . . . . . . . . 179
12.5 MC68HC912D60P Pierce Oscillator Specification . . . . . . . . . 194
12.2 Introduction
The oscillator implementation on the original 0.65µ (non-suffix) HC12 D-
family is a ‘Colpitts Oscillator with Translated Ground’. This design was
carried over to the first 0.5µ devices (A-suffix), up to the 1L02H mask set,
and is described in Section 12.3 MC68HC912D60A Oscillator
Specification. In this section of the document, the term
MC68HC912D60A refers only to the MC68HC912D60A device.
On mask set 2L02H, the Colpitts oscillator was updated, primarily to
improve its performance. To maximise the benefit of this change,
different external component values are required. However, the
oscillator will perform at least as well as the MC68HC912D60A version
with the same components. This implementation and the changes are
described in section 12.4 MC68HC912D60C Colpitts Oscillator
Specification.
In order to make the HC12 D-family oscillator options more flexible, a
Pierce oscillator configuration has been implemented on the 3L02H
mask set. This implementation, described in section 12.5
MC68HC912D60P Pierce Oscillator Specification, utilises the Automatic
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor
Oscillator
Technical Data
175