W83877ATF Datasheet, PDF (54/191 Pages) Winbond – enhanced version from Winbonds most popular I/O chip W83877F

W83877ATF
All Set s registers have a common register which is Sets Select Register (SSR), in order to switch to
any Set when configuring this register. The summary description of these Sets is shown below.
Set UART IR
Mode
Sets Description
0
¡ ³ ¡ ³ Legacy/Advanced UART Control and Status Registers.
1
¡ ³ ¡ ³ Legacy Baud Rate Divisor Register.
2
¡ ³ Advanced UART Control and Status Registers.
3
¡ ³ Version ID and Mapped Control Registers.
4
¡ ³ Transmitter/Receiver/Timer Counter Registers and IR Control Registers.
5
¡ ³ Flow Control and IR Control and Frame Status FIFO Registers.
6
¡ ³ IR Physical Layer Control Registers
7
¡ ³ Remote Control and IR front-end Module Selection Registers.
4.3.2 Set0-Legacy/Advanced UART Control and Status Registers
Address Register Name
Offset
Register Description
0
RBR/TBR Receiver/Transmitter Buffer Registers
1
ICR
Interrupt Control Register
2
ISR/UFR Interrupt Status or UART FIFO Control Register
3
UCR/SSR UART Control or Sets Select Register
4
HCR
Handshake Control Register
5
USR
UART Status Register
6
HSR
Handshake Status Register
7
UDR/ESCR User Defined Register
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 is, one TX DMA
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 CR2A, which selects DMA channel or
disables DMA channel. If RX DMA channel is enabled and TX DMA channel is disabled, then the
single DMA channel will be selected.
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Publication Release Date: April 1998
Version 0.51