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MC68HC812A4 Datasheet

  • MC68HC812A4

  • Microcontrollers

  • Motorola   Motorola

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Bus Control and Input/Output (I/O)
Registers
6.4.3 Port B Data Register
Address: $0001
Bit 7
Read:
PB7
Write:
Reset:
Expanded and peripheral:
0
ADDR7
0
ADDR6
0
ADDR5
0
ADDR4
0
ADDR3
0
ADDR2
0
ADDR1
0
ADDR0
PB6
PB5
PB4
PB3
PB2
PB1
PB0
6
5
4
3
2
1
Bit 0
Figure 6-3. Port B Data Register (PORTB)
Read: Anytime, if register is in the map
Write: Anytime, if register is in the map
Bits PB7鈥揚B0 correspond to address lines ADDR7鈥揂DDR0. When this
port is not used for external addresses such as in single-chip mode,
these pins can be used as general-purpose I/O. DDRB determines the
primary direction of each pin. This register is not in the on-chip map in
expanded and peripheral modes.
6.4.4 Port B Data Direction Register
Address: $0003
Bit 7
Read:
DDRB7
Write:
Reset:
0
0
0
0
0
0
0
0
DDRB6
DDRB5
DDRB4
DDRB3
DDRB2
DDRB1
DDRB0
6
5
4
3
2
1
Bit 0
Figure 6-4. Port B Data Direction Register (DDRB)
Read: Anytime, if register is in the map
Write: Anytime, if register is in the map
This register determines the primary direction for each port B pin when
functioning as a general-purpose I/O port. DDRB is not in the on-chip
map in expanded and peripheral modes.
1 = Associated pin is an output.
0 = Associated pin is a high-impedance input.
Advance Information
MOTOROLA
Bus Control and Input/Output (I/O)
MC68HC812A4
鈥?/div>
Rev. 3.0
97

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