MC912D60ACPVE8 Datasheet, PDF (137/460 Pages) Freescale Semiconductor, Inc – MC68HC912D60A MC68HC912D60C MC68HC912D60P Technical Data

Technical Data — MC68HC912D60A
Section 11. Clock Functions
11.1 Contents
11.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
11.3 Clock Sources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
11.4 Phase-Locked Loop (PLL) . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
11.5 Acquisition and Tracking Modes. . . . . . . . . . . . . . . . . . . . . . . 141
11.6 Limp-Home and Fast STOP Recovery modes . . . . . . . . . . . . 143
11.7 System Clock Frequency formulas . . . . . . . . . . . . . . . . . . . . . 162
11.8 Clock Divider Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
11.9 Computer Operating Properly (COP) . . . . . . . . . . . . . . . . . . . 166
11.10 Real-Time Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
11.11 Clock Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167
11.12 Clock Function Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
11.2 Introduction
Clock generation circuitry generates the internal and external ECLK
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 MC68HC912D60A.
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor
Clock Functions
Technical Data
137