MC912DG128A Motorola, MC912DG128A Datasheet - Page 85

• Manufacturer Part Number: MC912DG128A
• Description: Microcontrollers
• Manufacturer: Motorola

PORTB — Port B Register
PORTA — Port A Register
DDRA — Port A Data Direction Register
3-bus
MOTOROLA
Single Chip
Single Chip
Expanded
Expanded
Expanded
Expanded
& Periph:
RESET:
& Periph:
RESET:
RESET:
narrow
narrow
ADDR15/
ADDR15/
ADDR7/
DATA15/
ADDR7
DATA15
DDA7
DATA7
DATA7
Bit 7
Bit 7
PB7
Bit 7
PA7
0
—
—
ADDR14/
ADDR14/
ADDR6/
DATA14/
ADDR6
DATA14
DDA6
DATA6
DATA6
PB6
PA6
6
0
—
—
6
6
Bits PA[7:0] are associated respectively with addresses ADDR[15:8],
DATA[15:8] and DATA[7:0], in narrow mode. 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. DDRA determines the primary
direction of each pin. This register is not in the on-chip map in
expanded and peripheral modes. Read and write anytime.
This register determines the primary direction for each port A pin
when functioning as a general-purpose I/O port. DDRA is not in the
on-chip map in expanded and peripheral modes. Read and write
anytime.
0 = Associated pin is a high-impedance input
1 = Associated pin is an output
ADDR13/
ADDR13/
DATA13/
ADDR5/
DATA13
ADDR5
DDA5
DATA5
DATA5
PB5
PA5
5
0
—
—
5
5
Bus Control and Input/Output
ADDR12/
ADDR12/
DATA12/
ADDR4/
DATA12
ADDR4
DATA4
DDA4
DATA4
PB4
PA4
4
0
—
—
4
4
ADDR11/
ADDR11/
DATA11/
DATA11
ADDR3/
ADDR3
DATA3
DATA3
DDA3
PB3
PA3
3
0
—
—
3
3
ADDR10/
ADDR10/
DATA10/
DATA10
ADDR2/
ADDR2
DATA2
DATA2
DDA2
PA2
PB2
2
0
—
—
2
2
ADDR9/
ADDR9/
ADDR1/
DATA9/
DATA9
DATA1
ADDR1
DATA1
DDA1
PA1
PB1
MC68HC912DT128A Rev 2.0
Bus Control and Input/Output
—
1
0
—
1
1
ADDR8/
ADDR8/
DATA8/
ADDR0/
DATA8
DATA0
ADDR0
DATA0
DDA0
Bit 0
Bit 0
PA0
Bit 0
PB0
—
0
—
Registers
$0001
$0000
$0002
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