W90221X Winbond Electronics Corp America, W90221X Datasheet - Page 162

• Manufacturer Part Number: W90221X
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

FIFO Control Register (FCR)
Port address : 0xf00003fa (COM0)
Default : 0x1
Bits 0-1
Bit 4 DMA mode select
Bit 5 Reset TX FIFO
The TX FIFO
returned to 0
Bit 6 Reset RX FIFO
The RX FIFO
returned to 0
Bit 7 FIFO mode enable
this bit has no
W90221X version 0.6
0
RTH[0:1]
The DMA function is not implemented in this version.
Seting this bit will generate 1 OSC cycle reset pulse to reset TX FIFO.
becomes empty (TX-pointer is cleared to 0) after such reset. This bit is
automatically after the reset pulse is generated.
Seting this bit will generate 1 OSC cycle reset pulse to reset RX FIFO.
becomes empty (RX-pointer is cleared to 0) after such reset. This bit is
automatically after the reset pulse is generated.
The UART0 and UART1 are always operated on FIFO mode. Writing
effect while reading this bit always get logical one.
FCR[0:1]
0 0
0 1
1 0
1 1
0xf00002fa (COM1)
1
RX FIFO interrupt (Irpt_RDA) trigger level
2
Reserved
Irpt_RDA trigger level
(bytes)
3
01
04
08
14
DMOD TXRST RXRST FMEN
4
Write only
5
6
Power-on
7
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