MC68HC705J MOTOROLA [Motorola, Inc], MC68HC705J Datasheet - Page 92

• Manufacturer Part Number: MC68HC705J
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Parallel Input/Output (I/O) Ports
6.3.4 Port A LED Drive Capability
6.3.5 Port A I/O Pin Interrupts
6.4 Port B
6.4.1 Port B Data Register
Technical Data
92
Address:
The outputs for the upper four bits of port A (PA4–PA7) can drive
light-emitting diodes (LEDs). PA4–PA7 can sink approximately 10 mA of
current to V
If the PIRQ bit in the mask option register is programmed to logic 1,
PA0–PA3 pins function as external interrupt pins. See
External Interrupt Module
Port B is a 6-bit bidirectional port.
The port B data register (PORTB) contains a latch for each port B pin.
PB[5:0] — Port B Data Bits
Reset:
Read:
Write:
These read/write bits are software programmable. Data direction of
each port B pin is under the control of the corresponding bit in data
direction register B. Reset has no effect on port B data.
$0001
Bit 7
0
Parallel Input/Output (I/O) Ports
SS
Figure 6-6. Port B Data Register (PORTB)
.
= Unimplemented
6
0
PB5
5
(IRQ).
Unaffected by reset
PB4
4
PB3
3
MC68HC705J1A — Rev. 4.0
PB2
2
Section 8.
PB1
1
MOTOROLA
Bit 0
PB0