MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 78

• Manufacturer Part Number: MC68HC908KX2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

System Integration Module (SIM)
6.2 Introduction
Technical Data
78
6.8
6.8.1
6.8.2
6.8.2.1
6.8.2.2
6.8.2.3
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 the central processor unit (CPU) and
exception timing. Together with the CPU, the SIM controls all
microcontroller unit (MCU) activities.
A block diagram of the SIM is shown in
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 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
SIM Reset Status Register . . . . . . . . . . . . . . . . . . . . . . . . . 95
Interrupt Status Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . 96
System Integration Module (SIM)
Interrupt Status Register 1 . . . . . . . . . . . . . . . . . . . . . . . .97
Interrupt Status Register 2 . . . . . . . . . . . . . . . . . . . . . . . .97
Interrupt Status Register 3 . . . . . . . . . . . . . . . . . . . . . . . .98
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
Figure
6-1.
Figure 6-2
MOTOROLA
is a