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Motorola MC68HC908AB32 User Manual

Motorola MC68HC908AB32
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MC68HC908AB32 — Rev. 1.0 Technical Data
MOTOROLA System Integration Module (SIM) 109
Technical Data — MC68HC908AB32
Section 8. System Integration Module (SIM)
8.1 Contents
8.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110
8.3 SIM Bus Clock Control and Generation . . . . . . . . . . . . . . . . .112
8.3.1 Bus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113
8.3.2 Clock Start-Up from POR or LVI Reset . . . . . . . . . . . . . . .113
8.3.3 Clocks in Stop and Wait Modes . . . . . . . . . . . . . . . . . . . . .113
8.4 Reset and System Initialization. . . . . . . . . . . . . . . . . . . . . . . .113
8.4.1 External Pin Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
8.4.2 Active Resets from Internal Sources . . . . . . . . . . . . . . . . .114
8.4.2.1 Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
8.4.2.2 Computer Operating Properly (COP) Reset . . . . . . . . .116
8.4.2.3 Illegal Opcode Reset . . . . . . . . . . . . . . . . . . . . . . . . . . .117
8.4.2.4 Illegal Address Reset. . . . . . . . . . . . . . . . . . . . . . . . . . .117
8.4.2.5 Low-Voltage Inhibit (LVI) Reset . . . . . . . . . . . . . . . . . . .117
8.5 SIM Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .117
8.5.1 SIM Counter during Power-On Reset. . . . . . . . . . . . . . . . .118
8.5.2 SIM Counter during Stop Mode Recovery . . . . . . . . . . . . .118
8.5.3 SIM Counter and Reset States. . . . . . . . . . . . . . . . . . . . . .118
8.6 Exception Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118
8.6.1 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
8.6.1.1 Hardware Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . .120
8.6.1.2 SWI Instruction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121
8.6.2 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123
8.6.3 Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123
8.6.4 Status Flag Protection in Break Mode . . . . . . . . . . . . . . . .123
8.7 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
8.7.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
8.7.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125

Table of Contents

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Motorola MC68HC908AB32 Specifications

General IconGeneral
BrandMotorola
ModelMC68HC908AB32
CategoryController
LanguageEnglish

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