MC68HC705C8ACS

Manufacturer Part NumberMC68HC705C8ACS
ManufacturerFreescale Semiconductor, Inc
MC68HC705C8ACS datasheet
 
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Freescale Semiconductor, Inc.
7.5.3 Port C Logic
Figure 7-9
When a port C pin is programmed as an output, reading the port bit reads
the value of the data latch and not the voltage on the pin. When a port C
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 DDRC bit.
pins.
DDRC Bit
0
1
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 change I/O pins to outputs by writing to DDRC in user code as early
as possible.
MC68HC705C8A — Rev. 3
MOTOROLA
For More Information On This Product,
shows port C I/O logic.
READ $0006
WRITE $0006
DATA DIRECTION
REGISTER C
RESET
BIT DDRCx
PORT C DATA
WRITE $0002
REGISTER
BIT PCx
READ $0002
Figure 7-9. Port C I/O Logic
Table 7-3
summarizes the operation of the port C
Table 7-3. Port C Pin Functions
Accesses to DDRC
I/O Pin Mode
Read/Write
(1)
DDRC7–DDRC0
Input, Hi-Z
Output
DDRC7–DDRC0
Parallel Input/Output (I/O)
Go to: www.freescale.com
Parallel Input/Output (I/O)
Port C
PCx
Accesses to PORTC
Read
Write
(2)
Pin
PC7–PC0
PC7–PC0
PC7–PC0
or V
DD
SS
Technical Data