MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 126

• Manufacturer Part Number: MC68HC708AS48
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

System Integration Module (SIM)
9.2 Introduction
Advance Information
126
9.8
9.8.1
9.8.2
9.8.3
This section describes the system integration module (SIM), which
supports up to 24 external and/or internal interrupts. The SIM is a system
state controller that coordinates CPU and exception timing. Together
with the central processor unit (CPU), the SIM controls all MCU
activities. A block diagram of the SIM is shown in
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
Modular architecture expandable to 128 interrupt sources
SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144
System Integration Module (SIM)
SIM Break Status Register . . . . . . . . . . . . . . . . . . . . . . . .144
Reset Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
SIM Break Flag Control Register. . . . . . . . . . . . . . . . . . . .147
MC68HC708AS48
Figure
9-1.
Figure 9-2
MOTOROLA
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Rev. 4.0