mc68hc908qf4 Freescale Semiconductor, Inc, mc68hc908qf4 Datasheet - Page 48

• Manufacturer Part Number: mc68hc908qf4
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Auto Wakeup Module (AWU)
4.6.1 Port A I/O Register
4.6.2 Keyboard Status and Control Register
Data Sheet
48
NOTE:
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
PTA5–PTA0 bits are not used in conjuction with the auto wakeup feature. To see
a description of these bits, see
The keyboard status and control register (KBSCR):
Bits 7–4 — Not used
KEYF — Keyboard Flag Bit
Address: $0000
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.
•
•
•
Address: $001A
These read-only bits always read as 0s.
This read-only bit is set when a keyboard interrupt is pending on port A or auto
wakeup. Reset clears the KEYF bit.
Reset:
Reset:
Read:
Read:
Write:
Write:
1 = Auto wakeup interrupt request is pending
0 = Auto wakeup interrupt request is not pending
1 = Keyboard/auto wakeup interrupt pending
0 = No keyboard/auto wakeup interrupt pending
Flags keyboard/auto wakeup interrupt requests
Acknowledges keyboard/auto wakeup interrupt requests
Masks keyboard/auto wakeup interrupt requests
Freescale Semiconductor, Inc.
Figure 4-4. Keyboard Status and Control Register (KBSCR)
For More Information On This Product,
Bit 7
Bit 7
0
0
0
0
Go to: www.freescale.com
Auto Wakeup Module (AWU)
= Unimplemented
= Unimplemented
Figure 4-3. Port A Data Register (PTA)
AWUL
6
0
6
0
0
PTA5
13.2.1 Port A Data
5
5
0
0
PTA4
4
4
0
0
Unaffected by reset
KEYF
PTA3
3
3
0
Register.
ACKK
PTA2
MC68HC908QF4 — Rev. 1.0
2
2
0
0
IMASKK
PTA1
1
1
0
MOTOROLA
MODEK
PTA0
Bit 0
Bit 0
0