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MC68HC908GP20 Datasheet, PDF (197/406 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers | |||
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13.8 I/O Registers
These registers control and monitor operation of the keyboard module:
⢠Keyboard status and control register (INTKBSCR)
⢠Keyboard interrupt enable register (INTKBIER)
13.8.1 Keyboard Status and Control Register
The keyboard status and control register:
⢠Flags keyboard interrupt requests
⢠Acknowledges keyboard interrupt requests
⢠Masks keyboard interrupt requests
⢠Controls keyboard interrupt triggering sensitivity
Address: $001A
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
0
0
0
KEYF
0
IMASKK MODEK
Write:
ACKK
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 13-3. Keyboard Status and Control Register (INTKBSCR)
Bits 7â4 â Not used
These read-only bits always read as logic 0s.
KEYF â Keyboard Flag Bit
This read-only bit is set when a keyboard interrupt is pending. Reset
clears the KEYF bit.
1 = Keyboard interrupt pending
0 = No keyboard interrupt pending
MC68HC908GP20 â Rev 2.1
Freescale Semiconductor
Advance Information
197
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