MC68HC908QT2CPE Freescale, MC68HC908QT2CPE Datasheet - Page 51

• Manufacturer Part Number: MC68HC908QT2CPE
• Manufacturer: Freescale

Specifications of MC68HC908QT2CPE

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Total Internal Ram Size: 128Byte
• # I/os (max): 6
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 4-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 8
• Package Type: PDIP
• Program Memory Type: Flash
• Program Memory Size: 1.5KB
• Lead Free Status / RoHS Status: Compliant

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:
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
4.6.2 Keyboard Status and Control Register
The keyboard status and control register (KBSCR):
Freescale Semiconductor
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•
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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.
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1 = Auto wakeup interrupt request is pending
0 = Auto wakeup interrupt request is not pending
Port A data register (PTA)
Keyboard interrupt status and control register (KBSCR)
Keyboard interrupt enable register (KBIER)
Flags keyboard/auto wakeup interrupt requests
Acknowledges keyboard/auto wakeup interrupt requests
Masks keyboard/auto wakeup interrupt requests
Address: $0000
Address: $001A
PTA5–PTA0 bits are not used in conjuction with the auto wakeup feature.
To see a description of these bits, see
Reset:
Reset:
Read:
Read:
Write:
Write:
Figure 4-3. Keyboard Status and Control Register (KBSCR)
Bit 7
Bit 7
0
0
0
0
= Unimplemented
= Unimplemented
Figure 4-2. Port A Data Register (PTA)
AWUL
MC68HC908QY/QT Family Data Sheet, Rev. 6
6
0
6
0
0
PTA5
5
5
0
0
NOTE
PTA4
4
4
0
0
12.2.1 Port A Data
Unaffected by reset
KEYF
PTA3
3
3
0
ACKK
PTA2
2
2
0
0
Register.
IMASKK
PTA1
1
1
0
Input/Output Registers
MODEK
PTA0
Bit 0
Bit 0
0
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