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Serial 3 status register
Register symbol: SC3STR
Address:
x'3400083C
Purpose:
This register indicates the status of serial interface 3.
Bit No.
7
6
Bit
SC3
SC3
name
TXF RXF TBF RBF CTS
Reset
0
0
Access
R
R
Bit No.
Bit name
0
SC3OEF
1
SC3PEF
2
SC3FEF
3
SC3CTS
4
SC3RBF
5
SC3TBF
6
SC3RXF
7
SC3TXF
5
4
3
2
SC3
SC3
SC3
SC3
FEF
0
0
0
0
R
R
R
R
Description
Overrun error indication
0: No error
1: Overrun error occurred
Parity error indication
0: No error
1: Parity error occurred
Framing error indication
0: No error
1: Framing error occurred
External pin IRQ7 status indication
"0" when IRQ7 is "L", and "1" when "H".
Note: When P83A of the port 8 analog/digital input control register P8AD
is "1", IRQ7 is treated as "L" internally by the microcontroller and
reading the SC3CTS bit returns a value of "0", regardless of the actual
values of the port pins.
Reception buffer status indication
0: Reception buffer empty
1: Data exists in the reception buffer
Transmission buffer status indication
0: Transmission buffer empty
1: Data exists in the transmission buffer
Reception status indication
0: Waiting for reception
1: Reception in progress
Transmission status indication
0: Ready for transmission
1: Transmission in progress
1
0
SC3
SC3
PEF OEF
0
0
R
R
Serial Interface
13-43
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