Intel SA-1100 manual 11-128

11.10.10.4Transmit FIFO Service Request Flag (TFS)
(read-only, maskable interrupt)	11-122
11.10.10.5Receive FIFO Service Request Flag (RFS)
(read-only, maskable interrupt)	11-122
11.10.10.6Framing Error Status (FRE)
(read/write, nonmaskable interrupt)	11-123
11.10.11HSSP Status Register 1	11-124
11.10.11.1Receiver Synchronized Flag (RSY)
(read-only, noninterruptible)	11-124
11.10.11.2Transmitter Busy Flag (TBY)
(read-only, noninterruptible)	11-124
11.10.11.3Receive FIFO Not Empty Flag (RNE)
(read-only, noninterruptible)	11-124
11.10.11.4Transmit FIFO Not Full Flag (TNF)
(read-only, noninterruptible)	11-124
11.10.11.5End-of-Frame Flag (EOF)
(read-only, noninterruptible)	11-124
11.10.11.6CRC Error Status (CRE)
(read-only, noninterruptible)	11-125
11.10.11.7Receiver Overrun Status (ROR)
(read-only, noninterruptible)	11-125
11.10.12UART Register Locations	11-127
11.10.13HSSP Register Locations	11-127
11.11 Serial Port 3 - UART	11-128
11.11.1 UART Operation	11-128
11.11.1.1Frame Format	11-129
11.11.1.2Baud Rate Generation	11-129
11.11.1.3Receive Operation	11-129
11.11.1.4Transmit Operation	11-130
11.11.1.5Transmit and Receive FIFOs	11-130
11.11.1.6CPU and DMA Register Access Sizes	11-131
11.11.2 UART Register Definitions	11-131
11.11.3 UART Control Register 0	11-131
11.11.3.1Parity Enable (PE)	11-131
11.11.3.2Odd/Even Parity Select (OES)	11-131
11.11.3.3Stop Bit Select (SBS)	11-132
11.11.3.4Data Size Select (DSS)	11-132
11.11.3.5Sample Clock Enable (SCE)	11-132
11.11.3.6Receive Clock Edge Select (RCE)	11-132
11.11.3.7Transmit Clock Edge Select (TCE)	11-133
11.11.4 UART Control Registers 1 and 2	11-134
11.11.4.1Baud Rate Divisor (BRD)	11-134
11.11.5 UART Control Register 3	11-135
11.11.5.1Receiver Enable (RXE)	11-135
11.11.5.2Transmitter Enable (TXE)	11-135
11.11.5.3Break (BRK)	11-135
11.11.5.4Receive FIFO Interrupt Enable (RIE)	11-135
11.11.5.5Transmit FIFO Interrupt Enable (TIE)	11-136
11.11.5.6Loopback Mode (LBM)	11-136
11.11.6 UART Data Register	11-137
11.11.7 UART Status Register 0	11-139
11.11.7.1Transmit FIFO Service Request Flag (TFS)
(read-only, maskable interrupt)	11-139

xii SA-1100 Developer’s Manual