MC68HC08AB16A Datasheet, PDF (102/380 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
System Integration Module (SIM)
8.8 SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
8.8.1 SIM Break Status Register . . . . . . . . . . . . . . . . . . . . . . . . . 119
8.8.2 SIM Reset Status Register . . . . . . . . . . . . . . . . . . . . . . . . . 120
8.8.3 SIM Break Flag Control Register . . . . . . . . . . . . . . . . . . . . 121
8.2 Introduction
This section describes the system integration module (SIM), which
supports up to 24 external and/or internal interrupts. Together with the
CPU, the SIM controls all MCU activities. 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 a system state controller that coordinates CPU and exception
timing. The SIM is responsible for:
• Bus clock generation and control for CPU and peripherals:
– Stop/wait/reset/break entry and recovery
– Internal clock control
• Master reset control, including power-on reset (POR) and COP
timeout
• Interrupt control:
– Acknowledge timing
– Arbitration control timing
– Vector address generation
• CPU enable/disable timing
• Modular architecture expandable to 128 interrupt sources
Table 8-1 shows the internal signal names used in this section.
Technical Data
102
MC68HC08AB16A — Rev. 2.0
System Integration Module (SIM)
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