W90210F Datasheet, PDF (35/67 Pages) Winbond – PA-RISC EMBEDDED CONTROLLER

W90210F
3. Interrupt Identification:
IIR[4]
-
0
0
0
1
0
IIR[5]
-
0
0
1
1
1
IIR[6]
-
0
1
0
0
1
IIR[7]
1
0
0
0
0
0
Priority
-
4th
3rd
2nd
2nd
1st
Irpt type
None
Irpt_MOS
Irpt_THRE
Irpt_RDA
Irpt_TOUT
Irpt_RLS
* Irpt_RLS- caused by: Overrun Error or Parity Error or Framing Error or Break Interrupt.
- reset by: Reading LSR.
* Irpt_RDA- caused by: Received data >= RCVR trigger level.
- reset by: Reading RBR or RCVR FIFO drops below the trigger level.
* Irpt_TOUT- caused by: RCVR FIFO is non-empty and have not been accessed (Read/write) for the
time >= TOUR[1:7].
- reset by: Reading RBR.
* Irpt_THRE- caused by: THRE has been set.
- reset by: Reading IIR (if source of INTR is Irpt_THRE) or writing THR.
* Irpt_MOS- MODEM Status interrupt: Non-implemented.
4. RCVR Interrupt trigger level programing:
FCR[0]
0
0
1
1
FCR[1]
0
1
0
1
Trigger level
1 bytes
4 bytes
8 bytes
14 bytes
5. FCR[7] is always 1. Write FCR[7] to 0 has no effect.
6. Transmitter/Receiver Character length programing:
LCR[6]
0
0
1
1
LCR[7]
0
1
0
1
Character length
5 bits
6 bits
7 bits
8 bits
35
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Version 1.4, 10/8/97