M38203M4 Datasheet, PDF (302/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPENDIX
3.3 Control registers
Serial I/O1 status register
b7 b6 b5 b4 b3 b2 b1 b0
Serial I/O1 status register (SIO1STS) [Address 1916]
B
Name
Functions
At reset R W
0 Transmit buffer
empty flag (TBE)
0: Buffer full
1: Buffer empty
0
×
1 Receive buffer full flag 0: Buffer empty
(RBF)
1: Buffer full
0
×
2 ^{Transmit shift register shift 0: Transmit shift in progress} 0
×
completion flag (TSC)
1: Transmit shift completed
3 Overrun error flag
0: No error
0
×
(OE)
4 ^{Parity error flag}
(PE)
5 ^{Framing error flag}
(FE)
1: Overrun error
0: No error
1: Parity error
0: No error
1: Framing error
0
×
0
×
6 ^{Summing error flag} 0: (OE) U (PE) U (FE) = 0
0
×
(SE)
1: (OE) U (PE) U (FE) = 1
7 ^{Nothing is allocated. This bit cannot be written to}
and is fixed to “1” at reading.
1 1^×
Fig. 3.3.5 Structure of serial I/O1 status register
3–18
3820 GROUP USER’S MANUAL