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Serial Interface
13-43
Serial 3 status register
Register symbol: SC3STR
Address: x'3400083C
Purpose: This register indicates the status of serial interface 3.
Bit No. 7 6 543210
Bit SC3 SC3 SC3 SC3 SC3 SC3 SC3 SC3
name TXF RXF TBF RBF CTS FEF PEF OEF
Reset 0 0 000000
Access RRRRRRRR
Bit No. Bit name Description
0 SC3OEF Overrun error indication
0: No error
1: Overrun error occurred
1 SC3PEF Parity error indication
0: No error
1: Parity error occurred
2 SC3FEF Framing error indication
0: No error
1: Framing error occurred
3 SC3CTS 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.
4 SC3RBF Reception buffer status indication
0: Reception buffer empty
1: Data exists in the reception buffer
5 SC3TBF Transmission buffer status indication
0: Transmission buffer empty
1: Data exists in the transmission buffer
6 SC3RXF Reception status indication
0: Waiting for reception
1: Reception in progress
7 SC3TXF Transmission status indication
0: Ready for transmission
1: Transmission in progress