MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 76

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

System Integration Module (SIM)
7.2 Introduction
76
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
7.7.5
7.8
7.8.1
7.8.2
7.9
7.9.1
7.9.2
7.9.3
This section describes the system integration module (SIM), which
supports up to 24 external and/or internal interrupts. 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 7-2
state controller that coordinates CPU and exception timing.
The SIM is responsible for:
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•
•
•
•
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
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
Status Flag Protection in Break Mode . . . . . . . . . . . . . . . . . 93
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
SIM Reset Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Break Flag Control Register . . . . . . . . . . . . . . . . . . . . . . . . . 98
Break Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
System Integration Module (SIM)
is a summary of the SIM I/O registers. The SIM is a system
Figure
MOTOROLA
7-1.