Datasheet

MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA System Integration Module (SIM) 271
Technical Data — MC68HC908GR8
Section 19. System Integration Module (SIM)
19.1 Contents
19.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .271
19.3 SIM Bus Clock Control and Generation . . . . . . . . . . . . . . . . .275
19.4 Reset and System Initialization. . . . . . . . . . . . . . . . . . . . . . . .276
19.5 SIM Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .281
19.6 Exception Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .282
19.7 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .290
19.8 SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .293
19.2 Introduction
This section describes the system integration module (SIM). Together
with the CPU, the SIM controls all MCU activities. A block diagram of the
SIM is shown in Figure 19-1. Table 19-1 is a summary of the SIM
input/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 COP
timeout
• Interrupt control:
– Acknowledge timing
– Arbitration control timing
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