mc68hc11k4 Freescale Semiconductor, Inc, mc68hc11k4 Datasheet - Page 139

• Manufacturer Part Number: mc68hc11k4
• Description: Mc68hc11k1 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

6.4 Port B
M68HC11K Family
MOTOROLA
Single-Chip/Boot:
Expanded/Test: ADDR15
Address: $0004
Address: $0002
The state of port B (PB[7:0]) at reset is mode dependent. In single-chip
or bootstrap modes, port B pins are high-impedance inputs with
selectable internal pullup resistors (see
Resistors). Writes to DDRB can change any of the bits to outputs. In
expanded or test modes, port B pins provide the high-order address
lines ADDR[15:8] for external memory devices.
DDB[7:0] — Data Direction for Port B Bits
Reset:
Reset:
Read:
Read:
Write:
Write:
Freescale Semiconductor, Inc.
Figure 6-4. Port B Data Direction Register (DDRB)
For More Information On This Product,
0 = Input
1 = Output
DDB7
Figure 6-3. Port B Data Register (PORTB)
PB7I
Bit 7
Bit 7
PB7
0
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Parallel Input/Output
ADDR14
DDB6
PB6
PB6
6
6
0
ADDR13
DDB5
PB5
PB5
5
5
0
Undefined after reset
ADDR12
DDB4
PB4
PB4
4
4
0
6.11 Internal Pullup
ADDR11
DDB3
PB3
PB3
3
3
0
ADDR10
DDB2
PB2
PB2
2
2
0
Parallel Input/Output
ADDR9
DDB1
PB1
PB1
1
1
0
Technical Data
ADDR8
DDB0
Bit 0
Bit 0
PB0
PB0
Port B
0
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