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Pre-Processor
RTS_LEVEL=x
CTS = PIN_xx
CTS_LEVEL=x
FLOW_CONTROL_MODE
SIMPLEX_MODE
Specifies the active level of the RTS pin, HIGH is
active high and LOW is active low. Defaults to
LOW if not specified.
Pin to use for CTS flow control. In both
FLOW_CONTROL_MODE and SIMPLEX_MODE
this pin is sampled to see if it clear to send data. If
pin is at active level and there is data to send it will
send next data byte.
Specifies the active level of the CTS pin, HIGH is
active high and LOW is active low. Default to LOW
if not specified
Specifies how the RTS pin is used. For
FLOW_CONTROL_MODE the RTS pin is driven to
the active level when ready to receive data.
Defaults to FLOW_CONTROL_MODE when
neither FLOW_CONTROL_MODE or
SIMPLEX_MODE is specified. If RTS pin isn't
specified then this option is not used.
Specifies how the RTS pin is used. For
SIMPLEX_MODE the RTS pin is driven to the
active level when it has data to send. Defaults to
FLOW_CONTROL_MODE when neither
FLOW_CONTROL_MODE or SIMPLEX_MODE is
specified. If RTS pin isn't specified then this option
is not used.
Purpose:
This directive tells the compiler the baud rate and pins used for serial I/O. This
directive takes effect until another RS232 directive is encountered. The #USE
DELAY directive must appear before this directive can be used. This directive
enables use of built-in functions such as GETC, PUTC, and PRINTF. The functions
created with this directive are exported when using multiple compilation units. To
access the correct function use the stream identifier.
When using parts with built-in SCI and the SCI pins are specified, the SCI will be
used. If a baud rate cannot be achieved within 3% of the desired value using the
current clock rate, an error will be generated. The definition of the RS232_ERRORS
is as follows:
No UART:
? Bit 7 is 9th bit for 9 bit data mode (get and put).
? Bit 6 set to one indicates a put failed in float high mode.
With a UART:
? Used only by get:
? Copy of RCSTA register except:
? Bit 0 is used to indicate a parity error.
Warning:
The PIC UART will shut down on overflow (3 characters received by the hardware
131
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