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MC908QY1VDWE Datasheet(PDF) 51 Page - Freescale Semiconductor, Inc

No. de Pieza. MC908QY1VDWE
Descripción  M68HC08 Microcontrollers
Descarga  168 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC908QY1VDWE Datasheet(HTML) 51 Page - Freescale Semiconductor, Inc

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Input/Output Registers
MC68HC908QY/QT Family Data Sheet, Rev. 6
Freescale Semiconductor
51
4.6 Input/Output Registers
The AWU shares registers with the keyboard interrupt (KBI) module and the port A I/O module. The
following I/O registers control and monitor operation of the AWU:
Port A data register (PTA)
Keyboard interrupt status and control register (KBSCR)
Keyboard interrupt enable register (KBIER)
4.6.1 Port A I/O Register
The port A data register (PTA) contains a data latch for the state of the AWU interrupt request, in addition
to the data latches for port A.
AWUL — Auto Wakeup Latch
This is a read-only bit which has the value of the auto wakeup interrupt request latch. The wakeup
request signal is generated internally. There is no PTA6 port or any of the associated bits such as
PTA6 data direction or pullup bits.
1 = Auto wakeup interrupt request is pending
0 = Auto wakeup interrupt request is not pending
NOTE
PTA5–PTA0 bits are not used in conjuction with the auto wakeup feature.
To see a description of these bits, see 12.2.1 Port A Data Register.
4.6.2 Keyboard Status and Control Register
The keyboard status and control register (KBSCR):
Flags keyboard/auto wakeup interrupt requests
Acknowledges keyboard/auto wakeup interrupt requests
Masks keyboard/auto wakeup interrupt requests
Address: $0000
Bit 7
654321
Bit 0
Read:
0
AWUL
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
Write:
Reset:
0
0
Unaffected by reset
= Unimplemented
Figure 4-2. Port A Data Register (PTA)
Address: $001A
Bit 7
654321
Bit 0
Read:
0000
KEYF
0
IMASKK
MODEK
Write:
ACKK
Reset:
00000000
= Unimplemented
Figure 4-3. Keyboard Status and Control Register (KBSCR)


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