MC68HC705J1ACPE Datasheet, PDF (92/162 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.
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_SS.
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 Section 8.
External Interrupt Module (IRQ).
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: $0001
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
Write:
0
PB5
PB4
PB3
PB2
PB1
PB0
Reset:
Unaffected by reset
= Unimplemented
Figure 6-6. Port B Data Register (PORTB)
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
MC68HC705J1A — Rev. 4.0
Parallel Input/Output (I/O) Ports
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