MC68HC12 Datasheet, PDF (457/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit

Technical Data — MC68HC912DT128A
Section 24. Appendix: Information on MC68HC912DT128A
Mask Set Changes
24.1 Contents
24.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 457
24.3 Oscillator – Major Changes . . . . . . . . . . . . . . . . . . . . . . . . . .457
24.4 Flash Protection Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458
24.5 Clock Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .458
24.6 Pseudo Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458
24.7 Oscillator – Minor Changes . . . . . . . . . . . . . . . . . . . . . . . . . .459
24.8 PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459
24.2 Introduction
The following improvements were made to create the 1L05H mask set
(MC68HC912Dx128C) and the 2L05H mask set (MC68HC912Dx128P).
Previous MC68HC912DT128A mask sets 3K91D (TSMC wafer fab.)
and 0L05H (Motorola TSC6 wafer fab.) are equivalent with the only
change being the wafer fab location.
24.3 Oscillator – Major Changes
The following are the primary differences between the previous Colpitts
("A") and the new Colpitts ("C") oscillator configurations.
1. Optimisation of the bias current to the amplifier for less process
variation.
2. Addition of hysteresis to the clock input buffer to reduce sensitivity
to noise.
MC68HC912DT128A — Rev 4.0
MOTOROLA
Appendix: Information on MC68HC912DT128A Mask Set Changes
Technical Data
457