F81866A Datasheet, PDF (110/210 Pages) Feature Integration Technology Inc. – 6 UARTs Super IO With 128 Bytes FIFO and Power

Divisor Latch (LSB) ⎯ Base + 0
Bit
Name
R/W Reset Default
Description
Baud generator divisor low byte.
7-0
DLL
R/W LRESET# 01h _{Access only when LCR [7] is 1.}
F81866A
Divisor Latch (MSB) ⎯ Base + 1
Bit
Name
R/W Reset Default
Description
Baud generator divisor high byte.
7-0
DLM
R/W LRESET# 00h _{Access only when LCR [7] is 1.}
Interrupt Enable Register (IER) ⎯ Base + 1
Bit
Name
R/W Reset Default
Description
7-5
Reserved
-
-
- Reserved.
This bit is used only in 9-bit mode and always returns “0” when 9-bit mode is
disabled.
4
SM2
R/WC LRESET# 0 0: The receiver could receive data byte.
1: The receiver could only receive address byte and issue an interrupt when
the address is received.
3
EDSSI
R/W LRESET# 0 Enable Modem Status Interrupt. Access only when LCR [7] is 0.
2
ELSI
R/W LRESET# 0 Enable Line Status Error Interrupt. Access only when LCR [7] is 0.
Enable Transmitter Holding Register Empty Interrupt. Access only when LCR
1
ETBFI
R/W LRESET#
0
[7] is 0.
0
ERBFI
R/W LRESET# 0 Enable Received Data Available Interrupt. Access only when LCR [7] is 0.
Interrupt Identification Register (IIR) ⎯ Base + 2
Bit
Name
R/W Reset Default
Description
0: FIFO is disabled
7
FIFO_EN
R LRESET# 0 _{1: FIFO is enabled.}
0: FIFO is disabled
6
FIFO_EN
R LRESET# 0 _{1: FIFO is enabled.}
5-4
Reserved
3-1
IRQ_ID
- LRESET# - Reserved.
000: Interrupt is caused by Modem Status
001: Interrupt is caused by Transmitter Holding Register Empty
R LRESET# 00 ^{010: Interrupt is caused by Received Data Available.}
110: Interrupt is caused by Character Timeout
011: Interrupt is caused by Line Status.
1: Interrupt is not pending.
0
IRQ_PENDN
R LRESET# 1 _{0: Interrupt is pending.}
FIFO Control Register ⎯ Base + 2
Bit
Name
R/W Reset Default
Description
7-6
RCV_TRIG
00: Receiver FIFO trigger level is 1.
01: Receiver FIFO trigger level is 4.
W LRESET# 00 _{10: Receiver FIFO trigger level is 8.}
11: Receiver FIFO trigger level is 14.
110
Jan, 2012
V0. 12P