MC912DG128ACPVE Datasheet, PDF (193/478 Pages) Freescale Semiconductor, Inc – Upward compatible with M68HC11 instruction set

Freescale Semiconductor, Inc.
Oscillator
Contents
Technical Data — MC68HC912DT128A
Section 13. Oscillator
13.1 Contents
13.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
13.3 MC68HC912DT128A Oscillator Specification . . . . . . . . . . . .194
13.4 MC68HC912Dx128C Colpitts Oscillator Specification . . . . . . 197
13.5 MC68HC912Dx128P Pierce Oscillator Specification . . . . . . . 212
13.2 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 0L05H mask set,
and is described in Section 13.3 MC68HC912DT128A Oscillator
Specification. In this section of the document, the term
MC68HC912DT128A refers only to the MC68HC912DT128A and
MC68HC912DG128A devices.
On mask set 1L05H, 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 MC68HC912DT128A
version with the same components. This implementation and the
changes are described in section 13.4 MC68HC912Dx128C Colpitts
Oscillator Specification. In this section of the document, the term
MC68HC912Dx128C refers only to the MC68HC912DT128C and
MC68HC912DG128C devices.
In order to make the HC12 D-family oscillator options more flexible, a
Pierce oscillator configuration has been implemented on the 2L05H
MC68HC912DT128A — Rev 4.0
MOTOROLA
Oscillator
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Technical Data
193