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MC908QC8MDYER Datasheet(PDF) 90 Page - Freescale Semiconductor, Inc |
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MC908QC8MDYER Datasheet(HTML) 90 Page - Freescale Semiconductor, Inc |
90 / 274 page Keyboard Interrupt Module (KBI) MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 2 90 Freescale Semiconductor KEYF — Keyboard Flag Bit This read-only bit is set when a keyboard interrupt is pending. 1 = Keyboard interrupt pending 0 = No keyboard interrupt pending ACKK — Keyboard Acknowledge Bit Writing a 1 to this write-only bit clears the KBI request. ACKK always reads 0. IMASKK— Keyboard Interrupt Mask Bit Writing a 1 to this read/write bit prevents the output of the KBI latch from generating interrupt requests. 1 = Keyboard interrupt requests disabled 0 = Keyboard interrupt requests enabled MODEK — Keyboard Triggering Sensitivity Bit This read/write bit controls the triggering sensitivity of the keyboard interrupt pins. 1 = Keyboard interrupt requests on edge and level 0 = Keyboard interrupt requests on edge only 8.8.2 Keyboard Interrupt Enable Register (KBIER) KBIER enables or disables each keyboard interrupt pin. KBIE5–KBIE0 — Keyboard Interrupt Enable Bits Each of these read/write bits enables the corresponding keyboard interrupt pin to latch KBI interrupt requests. 1 = KBIx pin enabled as keyboard interrupt pin 0 = KBIx pin not enabled as keyboard interrupt pin R — Reserved bit This reserved bit should always be written to a 0 and will read 0. Bit 7 654321 Bit 0 Read: 0000 KEYF 0 IMASKK MODEK Write: ACKK Reset: 00000000 = Unimplemented Figure 8-3. Keyboard Status and Control Register (KBSCR) Bit 7 654321 Bit 0 Read: 0 R KBIE5 KBIE4 KBIE3 KBIE2 KBIE1 KBIE0 Write: Reset: 00000000 = Unimplemented Figure 8-4. Keyboard Interrupt Enable Register (KBIER) |
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