w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 62
w83977atf
Manufacturer Part Number
w83977atf
Description
Winbond I/o
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83977ATF.pdf
(207 pages)
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BDLAB = 0
BDLAB = 0
BDLAB = 0
BDLAB = 1
BDLAB = 1
Register Address Base
+ 0
+ 0
+ 1
+ 2
+ 2
+ 3
+ 4
+ 5
+ 6
+ 7
+ 0
+ 1
TABLE 3-1 UART Register Bit Map
*: Bit 0 is the least significant bit. The least significant bit is the first bit serially transmitted or received.
**: These bits are always 0 in 16450 Mode.
Status Register
Buffer Register
UART Control
Divisor Latch
Divisor Latch
UART Status
User Defined
(Write Only)
(Write Only)
(Read Only)
Transmitter
(Read Only)
UART FIFO
Handshake
Handshake
Receiver
Baudrate
Interrupt
Interrupt
Baudrate
Register
Register
Register
Register
Register
Register
Register
Register
Control
Control
Control
Status
Buffer
High
Low
RBR
UCR
HCR
USR
HSR
UDR
TBR
UFR
BHL
BLL
ICR
ISR
RBR Data
RBR Data
RX Data
TX Data
(ERDRI)
Terminal
Toggling
Interrupt
Interrupt
Pending
(TCTS)
(DLS0)
Enable
Enable
Length
(RDR)
Ready
Ready
(DTR)
Ready
Select
FIFO
"0" if
Data
Data
CTS
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 8
0
(ETBREI)
RX Data
Toggling
TX Data
Interrupt
Interrupt
Request
Overrun
(TDSR)
(DLS1)
Enable
Length
RCVR
(OER)
Empty
Status
Select
(RTS)
Bit (0)
Reset
FIFO
Send
Error
DSR
Bit 1
Bit 1
TBR
Data
Bit 1
Bit 1
Bit 1
Bit 9
to
1
Loopback
RI Falling
Stop Bits
Parity Bit
RX Data
(EUSRI)
Interrupt
TX Data
(MSBE)
(PBER)
Interrupt
Multiple
-43 -
Enable
Enable
(FERI)
Status
Bit (1)
Reset
Bit 10
XMIT
FIFO
Input
Error
Edge
Bit 2
Bit 2
Bit 2
Bit 2
USR
RI
2
Bit Number
Toggling
RX Data
Interrupt
(EHSRI)
Interrupt
TX Data
No Stop
(NSER)
(TDCD)
Bit (2)**
Enable
Enable
Enable
Status
Select
(PBE)
Parity
Bit 11
Mode
HSR
DMA
Error
DCD
Bit 3
Bit 3
Bit 3
Bit 3
IRQ
Bit
Bit
3
Publication Release Date: April 1998
Loopback
Reserved
Detected
RX Data
TX Data
to Send
Internal
Enable
Enable
(EPE)
(SBD)
(CTS)
Parity
Silent
Bit 12
Clear
Even
Bit 4
Bit 4
Bit 4
Bit 4
Byte
4
0
0
W83977ATF
PRELIMINARY
Reversed
RX Data
TX Data
Bit Fixed
Data Set
(TBRE)
Enable
PBFE)
(DSR)
Empty
Ready
Bit 13
Parity
Bit 5
Bit 5
TBR
Bit 5
Bit 5
5
0
0
0
Revision 0.52
Active Level
RX Data
Interrupt
Indicator
TX Data
Enabled
(TSRE)
Silence
Enable
FIFOs
Empty
(SSE)
(LSB)
Bit 14
TSR
Ring
Bit 6
Bit 6
Bit 6
Bit 6
(RI)
Set
RX
**
6
0
0
Data Carrier
Active Level
Access Bit
Indication
RX Data
(BDLAB)
(RFEI) **
Baudrate
RX FIFO
Interrupt
TX Data
Enabled
Divisor
FIFOs
(MSB)
Detect
(DCD)
Bit 15
Latch
Error
Bit 7
Bit 7
Bit 7
Bit 7
RX
**
7
0
0
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