MC68HC908QT4CPE Datasheet, PDF (52/192 Pages) Motorola, Inc – M68HC08 Microcontrollers

Auto Wakeup Module (AWU)
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.
Address: $0000
Bit 7
Read: 0
Write:
6
AWUL
5
PTA5
4
PTA4
3
PTA3
2
PTA2
1
PTA1
Bit 0
PTA0
Reset: 0
0
= Unimplemented
Unaffected by reset
Figure 4-3. Port A Data Register (PTA)
NOTE:
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
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: $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 4-4. Keyboard Status and Control Register (KBSCR)
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/auto wakeup interrupt pending
0 = No keyboard/auto wakeup interrupt pending
Data Sheet
52
Auto Wakeup Module (AWU)
MC68HC908QY/QT Family — Rev. 3
MOTOROLA