CCS C Compiler Manual PCB / PCM / PCH

Functional Overview
External Memory
Some PIC18 devices have the external memory functionality where the external memory can be
mapped to external memory devices like (Flash, EPROM or RAM). These functions are
available only on devices that support external memory bus.
General Purpose I/O
These options let the user configure and use the I/O pins on the device. These functions will
affect the pins that are listed in the device header file.
Relevant Functions:
output_high(pin)
output_low(pin)
output_float(pin)
output_x(value)
output_bit(pin,value)
input(pin)
input_state(pin)
set_tris_x(value)
input_change_x( )
Relevant Preprocessor:
#USE STANDARD_IO(port)
#USE FAST_IO(port)
#USE FIXED_IO
(port_outputs=;in,pin?)
Sets the given pin to high state.
Sets the given pin to the ground state.
Sets the specified pin to the input mode. This will allow the pin to
float high to represent a high on an open collector type of
connection.
Outputs an entire byte to the port.
Outputs the specified value (0,1) to the specified I/O pin.
The function returns the state of the indicated pin.
This function reads the level of a pin without changing the
direction of the pin as INPUT() does.
Sets the value of the I/O port direction register. A '1' is an input
and '0' is for output.
This function reads the levels of the pins on the port, and
compares them to the last time they were read to see if there was
a change, 1 if there was, 0 if there wasn't.
This compiler will use this directive be default and it will
automatically inserts code for the direction register whenever an
I/O function like output_high() or input() is used.
This directive will configure the I/O port to use the fast method of
performing I/O. The user will be responsible for setting the port
direction register using the set_tris_x() function.
This directive set particular pins to be used an input or output,
and the compiler will perform this setup every time this pin is
used.
Relevant Interrupts:
None
53