MC68HC912D60A Datasheet, PDF (443/460 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Technical Data — MC68HC912D60A
Section 23. Appendix: Information on MC68HC912D60A
Mask Set Changes
23.1 Contents
23.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443
23.3 Flash Protection Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443
23.4 Clock Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .444
23.5 Pseudo Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444
23.6 Oscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .444
23.7 PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445
23.2 Introduction
The following changes have been made on the MC68HC912D60A from
the 2K38K mask set to the 1L02H mask set.
Further improvements were made to the oscillator circuit to create the
2L02H mask set (MC68HC912D60C) and the 3L02H mask set
(MC68HC912D60P). These are described in detail in the oscillator
section of this document.
23.3 Flash Protection Feature
A flash protection bit has been added to the EEMCR register to protect
the Flash memory from accidental program or erasure. This bit is loaded
from the EEPROM Shadow word at reset, so that the flash can be
protected before any software is executed.
See EEPROM and Flash sections for more details.
MC68HC912D60A — Rev 3.0
MOTOROLA
Appendix: Information on MC68HC912D60A Mask Set Changes
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Technical Data
443