w83877atd Winbond Electronics Corp America, w83877atd Datasheet - Page 63

• Manufacturer Part Number: w83877atd
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

4.3.3 Set1 - Legacy Baud Rate Divisor Register
4.3.3.1 Set1.Reg0~1 - Baud Rate Divisor Latch (BLL/BHL)
The two registers of BLL and BHL are baud rate divisor latch in the legacy UART/SIR/ASK-IR mode.
Read/Write these registers, if set in Advanced UART mode, will occur backward operation, that is, will
go to legacy UART mode and clear some register values shown in the table below.
Note that DIS_BACK=1 (Disable Backward operation) in legacy UART/SIR/ASK-IR mode will not
affect any register which can operate legacy SIR/ASK-IR.
4.3.3.2 Set1.Reg 2~7
These registers are defined the same as the Set 0 registers.
Address
Offset
0
1
2
3
4
5
6
7
Register Name
Set & Register
UDR/ESCR
Set 0.Reg 4
Set 2.Reg 2
Set 4.Reg 3
UCR/SSR
ISR/UFR
BHL
HCR
USR
HSR
BLL
Baud Rate Divisor Latch (Low Byte)
Baud Rate Divisor Latch (High Byte)
Interrupt Status or UART FIFO Control Register
UART Control or Sets Select Register
Handshake Control Register
UART Status Register
Handshake Status Register
User Defined Register
Advanced Mode
DIS_BACK=×
Bit 0, 5, 7
- 59 -
Bit 7~5
Bit 2, 3
Register Description
Publication Release Date: April 1998
Legacy Mode
DIS_BACK=0
Bit 5, 7
W83877ATF
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Version 0.51