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SA-1110 Developer’s Manual 341
Peripheral Control Module
The following table shows the bit locations corresponding to the flag bits within UART status
register 1. Note that these flags do not generate interrupts, all bits are read-only, writes are ignored,
and reads of reserved bits return zeros.
Note: A question mark (?) signifies that the Reset value of that bit is undefined when the processor has
completed its reset cycle.
11.11.9 UART Register Locations
Table 11-19 shows the registers associated with serial port 3 and the physical addresses used to
access them.
0h 8005 0020 UTSR1 Read-Only
7 6 5 4 3 2 1 0
Reserved ROR FRE PRE TNF RNE
TBY
Reset
0 0 0 ? ? ? 0 0
Bits Name Description
0TBY
Transmitter busy flag (read-only).
0 – Transmitter is idle or UART is disabled.
1 – Transmit logic is currently transmitting a frame (data within the serial shifter); no
interrupt generated.
1 RNE
Receive FIFO not empty (read-only).
0 – Receive FIFO is empty.
1 – Receive FIFO is not empty (no interrupt generated).
2TNF
Transmit FIFO not full (read-only).
0 – Transmit FIFO is full.
1 – Transmit FIFO is not full (no interrupt generated).
3PRE
Parity error (read-only).
0 – No parity errors encountered in the receipt of the next data value in the FIFO (or parity
disabled).
1 – Parity error encountered in the receipt of the next data value in the FIFO (no interrupt
generated).
4FRE
Framing error (read-only).
0 – Stop bit for the next frame in the FIFO was a one.
1– Stop bit for the next frame in the FIFO was a zero (no interrupt generated).
5ROR
Receive FIFO overrun (read-only).
0 – Receive FIFO has not experienced an overrun.
1 – Receive logic attempted to place data into receive FIFO while it was full, the next data
valueintheFIFOisthelastpieceof“good” data before the FIFO was overrun (no interrupt
generated).
7..6 — Reserved.
Table 11-19. Serial Port 3 Control, Data, and Status Register Locations (Sheet 1 of 2)
Address Name Description
0h 8005 0000 UTCR0 UART control register 0
0h 8005 0004 UTCR1 UART control register 1
0h 8005 0008 UTCR2 UART control register 2