MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 157

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

Technical Data — MC68HC912DT128A
12.1 Contents
12.2 Introduction
MC68HC912DT128A — Rev 4.0
MOTOROLA
12.2
12.3
12.4
12.5
12.6
12.7
12.8
12.9
12.10 Real-Time Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
12.11 Clock Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186
12.12 Clock Function Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Clock generation circuitry generates the internal and external E-clock
signals as well as internal clock signals used by the CPU and on-chip
peripherals. A clock monitor circuit, a computer operating properly
(COP) watchdog circuit, and a periodic interrupt circuit are also
incorporated into the MC68HC912DT128A.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Clock Sources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .158
Phase-Locked Loop (PLL) . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Acquisition and Tracking Modes. . . . . . . . . . . . . . . . . . . . . . .161
Limp-Home and Fast STOP Recovery modes . . . . . . . . . . . . 163
System Clock Frequency Formulae . . . . . . . . . . . . . . . . . . . . 181
Clock Divider Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
Computer Operating Properly (COP) . . . . . . . . . . . . . . . . . . .185
Clock Functions
Section 12. Clock Functions
Technical Data
157