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MC908QT4VFQE Datasheet(PDF) 83 Page - Freescale Semiconductor, Inc |
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MC908QT4VFQE Datasheet(HTML) 83 Page - Freescale Semiconductor, Inc |
83 / 168 page Input/Output Registers MC68HC908QY/QT Family Data Sheet, Rev. 6 Freescale Semiconductor 83 To protect the latch during the break state, write a 0 to the BCFE bit. With BCFE at 0 (its default state), writing to the keyboard acknowledge bit (ACKK) in the keyboard status and control register during the break state has no effect. 9.7 Input/Output Registers The following I/O registers control and monitor operation of the keyboard interrupt module: • Keyboard interrupt status and control register (KBSCR) • Keyboard interrupt enable register (KBIER) 9.7.1 Keyboard Status and Control Register The keyboard status and control register (KBSCR): • Flags keyboard interrupt requests • Acknowledges keyboard interrupt requests • Masks keyboard interrupt requests • Controls keyboard interrupt triggering sensitivity Bits 7–4 — Not used These read-only bits always read as 0s. KEYF — Keyboard Flag Bit This read-only bit is set when a keyboard interrupt is pending on port A or auto wakeup. Reset clears the KEYF bit. 1 = Keyboard interrupt pending 0 = No keyboard interrupt pending ACKK — Keyboard Acknowledge Bit Writing a 1 to this write-only bit clears the keyboard interrupt request on port A and auto wakeup logic. ACKK always reads as 0. Reset clears ACKK. IMASKK— Keyboard Interrupt Mask Bit Writing a 1 to this read/write bit prevents the output of the keyboard interrupt mask from generating interrupt requests on port A or auto wakeup. Reset clears the IMASKK bit. 1 = Keyboard interrupt requests masked 0 = Keyboard interrupt requests not masked MODEK — Keyboard Triggering Sensitivity Bit This read/write bit controls the triggering sensitivity of the keyboard interrupt pins on port A and auto wakeup. Reset clears MODEK. 1 = Keyboard interrupt requests on falling edges and low levels 0 = Keyboard interrupt requests on falling edges only Address: $001A Bit 7 654321 Bit 0 Read: 0000 KEYF 0 IMASKK MODEK Write: ACKK Reset: 00000000 = Unimplemented Figure 9-3. Keyboard Status and Control Register (KBSCR) |
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