MC68HC705C8ACS

Manufacturer Part NumberMC68HC705C8ACS
ManufacturerFreescale Semiconductor, Inc
MC68HC705C8ACS datasheet
 


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Page 84/222:

Port B Pin Functions

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Freescale Semiconductor, Inc.
Parallel Input/Output (I/O)
When a port B pin is programmed as an output, reading the port bit reads
the value of the data latch and not the voltage on the pin itself. When a
port B pin is programmed as an input, reading the port bit reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its DDRB bit.
DDRB Bit
1. Hi-Z = high impedance
2. Writing affects data register but does not affect input.
NOTE:
To avoid excessive current draw, tie all unused input pins to V
or for I/O pins change to outputs by writing to DDRB in user code as early
as possible.
Technical Data
84
Table 7-2. Port B Pin Functions
Accesses to DDRB
I/O Pin Mode
Read/Write
(1)
0
DDRB7–DDRB0
Input, Hi-Z
1
Output
DDRB7–DDRB0
Parallel Input/Output (I/O)
For More Information On This Product,
Go to: www.freescale.com
Accesses to PORTB
Read
Write
(2)
Pin
PB7–PB0
PB7–PB0
PB7–PB0
or V
,
DD
SS
MC68HC705C8A — Rev. 3