MC68HC705 MOTOROLA [Motorola, Inc], MC68HC705 Datasheet - Page 79

• Manufacturer Part Number: MC68HC705
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

7.4 Port B
7.4.1 Port B Data Register
MC68HC705C8A — Rev. 2.0
MOTOROLA
Address:
Port B is an 8-bit, general-purpose, bidirectional I/O port. Port B pins can
also be configured to function as external interrupts. The port B pullup
devices are enabled in mask option register 1 (MOR1). See
Option Register 1
The port B data register (PORTB) shown in
latch for each of the eight port B pins.
PB7–PB0 — Port B Data Bits
Reset:
Read:
Write:
These read/write bits are software programmable. Data direction of
each bit is under the control of the corresponding bit in data direction
register B. Reset has no effect on port B data.
$0001
Bit 7
PB7
Figure 7-4. Port B Data Register (PORTB)
Parallel Input/Output (I/O)
PB6
6
and
4.3.3 Port B
PB5
5
Unaffected by reset
PB4
4
Interrupts.
PB3
3
Figure 7-4
PB2
Parallel Input/Output (I/O)
2
contains a data
PB1
1
Technical Data
9.5.2 Mask
Bit 0
PB0
Port B
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