MC68HC908RF2 Datasheet, PDF (82/254 Pages) Motorola, Inc – HCMOS Microcontroller Unit

System Integration Module (SIM)
6.8 SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
6.8.1 SIM Break Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . 99
6.8.2 SIM Reset Status Register . . . . . . . . . . . . . . . . . . . . . . . . 100
6.8.3 SIM Break Flag Control Register . . . . . . . . . . . . . . . . . . . . 101
6.2 Introduction
This section describes the system integration module (SIM). Together
with the central processor unit (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 6-1.
Figure 6-2 is a summary of the SIM input/output (I/O) registers.
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
Advance Information
82
System Integration Module (SIM)
MC68HC908RF2 — Rev. 1
MOTOROLA