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MC68HC908JB8 Datasheet, PDF (94/286 Pages) Motorola, Inc – MICROCONTROLLERS | |||
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System Integration Module (SIM)
8.7 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
8.7.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110
8.7.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112
8.8 SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
8.8.1 Break Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
8.8.2 Reset Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
8.8.3 Break Flag Control Register . . . . . . . . . . . . . . . . . . . . . . .116
8.2 Introduction
This section describes the system integration module (SIM), which
supports up to 8 external and/or internal interrupts. Together with the
CPU, the SIM controls all MCU activities. The SIM is a system state
controller that coordinates CPU and exception timing. A block diagram
of the SIM is shown in Figure 8-1. Figure 8-2 is a summary of the SIM
I/O registers. The SIM is responsible for:
⢠Bus clock generation and control for CPU and peripherals
â Stop/wait/reset/break entry and recovery
â Internal clock control
⢠Master reset control, including power-on reset (POR) and COP
timeout
⢠Interrupt control:
â Acknowledge timing
â Arbitration control timing
â Vector address generation
⢠CPU enable/disable timing
⢠Modular architecture expandable to 128 interrupt sources
Technical Data
94
MC68HC908JB8â¢MC68HC08JB8â¢MC68HC08JT8 â Rev. 2.3
System Integration Module (SIM)
Freescale Semiconductor
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