MC68HC912BD32 Datasheet, PDF (101/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Clocks
Clocks
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Clock Selection and Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Slow Mode Divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
CGM Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Clock Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Computer Operating Properly (COP) . . . . . . . . . . . . . . . . . . . . . . . . 101
Real-Time Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Clock Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Clock Function Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Clock Divider Chains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Introduction
The clock generation module (CGM) generates the system clocks and
generates and controls the timing of the reset and power-on reset logic.
The clock generation module is composed of:
• clock selection and generation circuitry
• slow mode clock divider
• reset and stop generation timing and control
Clock Selection and Generation
The clock generation module generates the P clock, the E clock, and
four T clocks. The P clock and E clock are used by all device modules
except the CPU. The T clocks are used by the CPU.
1-clock
Clocks
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MC68HC912BD32 Rev 1.0