w83877atd Winbond Electronics Corp America, w83877atd Datasheet - Page 54

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

All Set s registers have a common register which is Sets Select Register
any Set when configuring this register. The summary description of these Sets is shown below.
4.3.2 Set0-Legacy/Advanced UART Control and Status Registers
4.3.2.1 Set0.Reg0 - Receiver/Transmitter Buffer Registers (RBR/TBR) (Read/Write)
Receiver Buffer Register is read only and Transmitter Buffer Register is write only. These registers
are described the ame as legacy UART.
In legacy UART, this port only supports PIO mode. In dvanced UART, if setup to MIR/FIR/Remote IR,
this port will support DMA handshake function. Two DMA channels can be used, that
channel and another RX DMA channel. Therefore, single DMA channel is also supported when the bit
of D_CHSW (DMA Channel Swap, in Set2.Reg2.Bit3) is set and the TX/RX DMA channel is swapped.
Note that two DMA channels are defined in config register
disables DMA channel. If RX DMA channel is enabled and TX DMA channel is disabled, then the
single DMA channel will be selected.
Address
Offset
Set
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
UART
¡ ³
¡ ³
Register Name
UDR/ESCR
RBR/TBR
UCR/SSR
ISR/UFR
HCR
USR
HSR
Mode
ICR
IR
¡ ³ Legacy/Advanced UART Control and Status Registers.
¡ ³ Legacy Baud Rate Divisor Register.
¡ ³ Advanced UART Control and Status Registers.
¡ ³ Version ID and Mapped Control Registers.
¡ ³ Transmitter/Receiver/Timer Counter Registers and IR Control Registers.
¡ ³ Flow Control and IR Control and Frame Status FIFO Registers.
¡ ³ IR Physical Layer Control Registers
¡ ³ Remote Control and IR front-end Module Selection Registers.
Receiver/Transmitter Buffer Registers
Interrupt Control Register
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
- 50 -
Register Description
Sets Description
CR2A,
Publication Release Date: April 1998
which selects DMA channel or
(SSR),
W83877ATF
in order to switch to
is,
one TX DMA
Version 0.51