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11-126 SA-1100
Developer’s Manual
Peripheral Control Module
The following table shows the location of the flags within HSSP status register 1. The bits within
this register are read-only and do not produce interrupt requests. Note that writes to bit 7 are
ignored and reads return zero.
Address: 0h 8004 0078 HSSR1 Read-Only
Bit 76543210
Res. ROR CRE EOF TNF RNE TBY RSY
Reset00001000
Bit Name Description
0RSY
Receiver synchronized flag (read-only).
0 – Receiver is in hunt more or is disabled.
1 – Receiver logic is synchronized with the incoming data (no interrupt generated).
1TBY
Transmitter busy flag (read-only).
0 – Transmitter is idle (continuous preambles) or disabled.
1 – Transmit logic is currently transmitting a frame (address, control, data, CRC, or
start/stop flag); no interrupt generated.
2 RNE
Receive FIFO not empty (read-only).
0 – Receive FIFO is empty.
1 – Receive FIFO is not empty (no interrupt generated).
3TNF
Transmit FIFO not full (read-only).
0 – Transmit FIFO is full.
1 – Transmit FIFO is not full (no interrupt generated).
4EOF
End of frame (read-only).
0 – Current frame has not completed.
1 – The value at the bottom of the receive FIFO is the last byte of data within the frame.
5 CRE
CRC error (read-only).
0 – No CRC check errors encountered in the receipt of data.
1 – CRC calculated on the incoming data. Does not match CRC value contained within
the received frame.
6ROR
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.
7 — Reserved.