MC68HC908GR16 Datasheet, PDF (195/310 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Data Sheet — MC68HC908GR16
Section 15. System Integration Module (SIM)
15.1 Introduction
This section describes the system integration module (SIM). Together with the
central processor unit (CPU), the SIM controls all microcontroller unit (MCU)
activities. A block diagram of the SIM is shown in Figure 15-2. Table 15-1 is a
summary of the SIM input/output (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 computer
operating properly (COP) timeout
• Interrupt control:
– Acknowledge timing
– Arbitration control timing
– Vector address generation
• CPU enable/disable timing
• Modular architecture expandable to 128 interrupt sources
Table 15-1 shows the internal signal names used in this section.
MC68HC908GR16 — Rev. 1.0
MOTOROLA
System Integration Module (SIM)
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Data Sheet
195