| 摘要 |
A peripheral component (104) is attached to a portable electronic device (102), and indicates an option class of the peripheral component by use of a n option select circuit. The option select circuit causes an interrupt to be generated in the portable electronic device, which then determines the optio n class by changing the logic levels of various option select lines. If an inversion of the logic state of one of the option select lines is detected, then the portable electronic device knows an option select circuit is presen t, and determines the option class of the peripheral component accordingly.</SD OAB>
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