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MC908QL2V Datasheet(PDF) 94 Page - Motorola, Inc

No. de Pieza. MC908QL2V
Descripción  Microcontrollers
Descarga  222 Pages
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Fabricante  MOTOROLA [Motorola, Inc]
Página de inicio  http://www.freescale.com
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MC908QL2V Datasheet(HTML) 94 Page - Motorola, Inc

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Keyboard Interrupt Module (KBI)
MC68HC908QL4 • MC68HC908QL3 • MC68HC908QL2 Data Sheet, Rev. 4
94
Freescale Semiconductor
9.8.1 Keyboard Status and Control Register (KBSCR)
Features of the KBSCR:
Flags keyboard interrupt requests
Acknowledges keyboard interrupt requests
Masks keyboard interrupt requests
Controls keyboard interrupt triggering sensitivity
Bits 7–4 — Not used
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
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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