w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 66
w83977atf
Manufacturer Part Number
w83977atf
Description
Winbond I/o
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83977ATF.pdf
(207 pages)
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Bit 2: FERI. This bit indicates that the RI pin has changed from low to high state after HSR was read
Bit 1: TDSR. This bit indicates that the DSR pin has changed state after HSR was read by the CPU.
Bit 0: TCTS. This bit indicates that the CTS pin has changed state after HSR was read.
3.2.5 UART FIFO Control Register (UFR) (Write only)
This register is used to control the FIFO functions of the UART.
Bit 6, 7: These two bits are used to set the active level for the receiver FIFO interrupt. For example, if
TABLE 3-3 FIFO TRIGGER LEVEL
Bit 4, 5: Reserved
Bit 3: When this bit is programmed to logic 1, the DMA mode will change from mode 0 to mode 1 if
Bit 2: Setting this bit to a logical 1 resets the TX FIFO counter logic to initial state. This bit will clear to
Bit 1: Setting this bit to a logical 1 resets the RX FIFO counter logic to initial state. This bit will clear to
Bit 0: This bit enables the 16550 (FIFO) mode of the UART. This bit should be set to a logical 1
BIT 7
by the CPU.
the interrupt active level is set as 4 bytes, once there are more than 4 data characters in the
receiver FIFO, the interrupt will be activated to notify the CPU to read the data from the FIFO.
UFR bit 0 = 1.
a logical 0 by itself after being set to a logical 1.
a logical 0 by itself after being set to a logical 1.
before other bits of UFR are programmed.
0
0
1
1
BIT 6
7
0
1
0
1
6
5
RX FIFO INTERRUPT ACTIVE LEVEL (BYTES)
4
3
2
-47 -
1
01
04
08
14
0
FIFO enable
Receiver FIFO reset
Transmitter FIFO reset
DMA mode select
Reserved
Reserved
RX interrupt active level (LSB)
RX interrupt active level (MSB)
Publication Release Date: April 1998
W83977ATF
PRELIMINARY
Revision 0.52
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