Freescale Semiconductor, Inc.
Advance Information — MC68HC908RFRK2
Section 14. Keyboard/External Interrupt Module (KBI)
14.1 Contents
14.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
14.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
14.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
14.4.1 External Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
14.4.2 IRQ1 Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186
14.4.3 KBI Module During Break Interrupts. . . . . . . . . . . . . . . . . .187
14.4.4 Keyboard Interrupt Pins . . . . . . . . . . . . . . . . . . . . . . . . . . .187
14.4.5 Keyboard Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . .189
14.5 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
14.5.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
14.5.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
14.6 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191
14.6.1 IRQ and Keyboard Status and Control Register . . . . . . . .191
14.6.2 Keyboard Interrupt Enable Register. . . . . . . . . . . . . . . . . .193
14.2 Introduction
This section describes the maskable external interrupt (IRQ1) input and
six independently maskable keyboard wakeup interrupt pins.
MC68HC908RFRK2
MOTOROLA
Advance Information
Keyboard/External Interrupt Module (KBI)
183
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