W83977G Winbond Electronics Corp America, W83977G Datasheet - Page 52

• Manufacturer Part Number: W83977G
• Description: W83877TF plus KBC, CIR, RTC, Pb-free
• Manufacturer: Winbond Electronics Corp America

6.2.5
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 6-3 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 before
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
BIT 7
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.
other bits of UFR are programmed.
0
0
1
1
UART FIFO Control Register (UFR) (Write only)
7
BIT 6
6
0
1
0
1
5
4
3
2
RX FIFO INTERRUPT ACTIVE LEVEL (BYTES)
1
-44
0
FIFO enable
Receiver FIFO reset
Transmitter FIFO reset
DMA mode select
Reserved
Reserved
RX interrupt active level (LSB)
RX interrupt active level (MSB)
01
04
08
14