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11-144 SA-1100
Developer’s Manual
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.
Address: 0h 8005 0020 UTSR1 Read-Only
Bit 76543210
Reserved ROR FRE PRE TNF RNE TBY
Reset00000100
Bit 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 value in the FIFO is the last piece of “good” data before the FIFO was overrun (no
interrupt generated).
7..6 — Reserved.