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Texas Instruments TMS320C3x Manuale Utente

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Pagina di 757
Serial Ports
 
12-24
Table 12–4. FSR/DR/CLKR Port-Control Register Bits Summary 
Abbreviation
Reset
Value
Name
Description
CLKR FUNC
0
Clock receive
function
Controls the function of CLKR.
If CLKR FUNC  =  0, CLKR is configured as a general-purpose
digital I/O port.
If CLKR FUNC = 1, CLKR is configured as a serial port pin.
CLKR I/O
0
Clock receive 
input/output
mode
If CLKR I/O = 0, CLKR is configured as a general-purpose input
pin.
If CLKR I/O = 1, CLKR is configured as a general-purpose output
pin.
CLKR DATOUT
0
Clock receive
data output
Data output on CLKR when configured as general-purpose
output.
CLKR DATIN
x
†
Clock receive
data input
Data input on CLKR when configured as general-purpose input.
A write has no effect.
DR FUNC
0
DR function
Controls the function of DR.
If DR FUNC = 0, DR is configured as a general-purpose digital
I/O port.
If DR FUNC = 1, DR is configured as a serial port pin.
DR I/O
0
DR input/output
mode
If DR I/O  =  0, DR is configured as a general-purpose input pin.
If DR I/O  =  1, DR is configured as a general-purpose output pin.
DR DATOUT
0
DR data output
Data output on DR when configured as general-purpose output.
DR DATIN
x
†
DR data input
Data input on DR when configured as general-purpose input.
A write has no effect.
FSR FUNC
0
FSR function
FSR FUNC controls the function of FSR.
If FSR FUNC = 0, FSR is configured as a general-purpose digital
I/O port.
If FSR FUNC  =  1, FSR is configured as a serial port pin.
FSR I/O
0
FSR input/output
mode
If FSR I/O  =  0, FSR is configured as a general-purpose input
pin.
If FSR I/O  =  1, FSR is configured as a general-purpose output
pin.
FSR DATOUT
0
FSR data output
Data output on FSR when configured as general-purpose output.
FSR DATIN
x
†
FSR data input
Data input on FSR when configured as general-purpose input.
A write has no effect.
† x = 0 or 1.