MC68HC705J1A Port B - Motorola

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MC68HC705J1A

Manufacturer Part Number
MC68HC705J1A
Description
Manufacturer
Motorola
Datasheet

Specifications of MC68HC705J1A

Case
DIP-20L
Parallel Input/Output (I/O) Ports
6.3.4 Port A LED Drive Capability
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
6.3.5 Port A I/O Pin Interrupts
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
6.4 Port B
Port B is a 6-bit bidirectional port.
6.4.1 Port B Data Register
The port B data register (PORTB) contains a latch for each port B pin.
Address:
Read:
Write:
Reset:
PB[5:0] — Port B Data Bits
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.
Technical Data
92
.
SS
(IRQ).
$0001
Bit 7
6
5
4
0
0
PB5
PB4
Unaffected by reset
= Unimplemented
Figure 6-6. Port B Data Register (PORTB)
Parallel Input/Output (I/O) Ports
Section 8.
3
2
1
Bit 0
PB3
PB2
PB1
PB0
MC68HC705J1A — Rev. 4.0
MOTOROLA

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