MC912DG128A Motorola, MC912DG128A Datasheet - Page 9
MC912DG128A
Manufacturer Part Number
MC912DG128A
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC912DG128A.pdf
(404 pages)
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Resets and
Interrupts
I/O Ports With Key
Wake-Up
Clock Functions
Pulse-Width
Modulator
MOTOROLA
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Exception Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Maskable interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Latching of Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Interrupt Control and Priority Registers . . . . . . . . . . . . . . . . . . . . . . 119
Interrupt test registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Effects of Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Register Stacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Key Wake-up and port Registers . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Key Wake-Up Input Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Clock Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Phase-Locked Loop (PLL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Acquisition and Tracking Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Limp-Home and Fast STOP Recovery modes . . . . . . . . . . . . . . . . 141
System Clock Frequency Formulae . . . . . . . . . . . . . . . . . . . . . . . . 159
Clock Divider Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Computer Operating Properly (COP) . . . . . . . . . . . . . . . . . . . . . . . 163
Real-Time Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Clock Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Clock Function Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
PWM Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
PWM Boundary Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Table of Contents
MC68HC912DT128A Rev 2.0
Table of Contents
9
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