MC68HC908MR8 Datasheet, PDF (90/372 Pages) Motorola, Inc – Microcontrollers

System Integration Module (SIM)
7.2 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 7-1. Figure 7-2 is a summary of the SIM inout/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
Technical Data
90
System Integration Module (SIM)
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor