Datasheet

MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA Resets and Interrupts 61
Technical Data — MC68HC908GR8
Section 4. Resets and Interrupts
4.1 Contents
4.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
4.3 Resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
4.4 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
4.2 Introduction
Resets and interrupts are responses to exceptional events during
program execution. A reset re-initializes the MCU to its startup condition.
An interrupt vectors the program counter to a service routine.
4.3 Resets
A reset immediately returns the MCU to a known startup condition and
begins program execution from a user-defined memory location.
4.3.1 Effects
A reset:
• Immediately stops the operation of the instruction being executed
• Initializes certain control and status bits
• Loads the program counter with a user-defined reset vector
address from locations $FFFE and $FFFF
• Selects CGMXCLK divided by four as the bus clock
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cale Semiconductor,
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