W83977ATF Datasheet, PDF (61/207 Pages) Winbond – WINBOND I/O

W83977ATF
PRELIMINARY
3.0 UART PORT
3.1 Universal Asynchronous Receiver/Transmitter (UART A, UART B)
The UARTs are used to convert parallel data into serial format on the transmit side and, convert serial
data to parallel format on the receiver side. The serial format, in order of transmission and reception,
is a start bit, followed by five to eight data bits, a parity bit (if programmed) and one, one and half
(five-bit format only) or two stop bits. The UARTs are capable of handling divisors of 1 to 65535 and
producing a 16x clock for driving the internal transmitter logic. Provisions are also included to use
this 16x clock to drive the receiver logic. The UARTs also support the MIDI data rate. Furthermore,
the UARTs also include complete modem control capability and a processor interrupt system that
may be software trailed to the computing time required to handle the communication link. The
UARTs have a FIFO mode to reduce the number of interrupts presented to the CPU. In each UART,
there are 16-byte FIFOs for both receive and transmit mode.
3.2 Register Address
3.2.1 UART Control Register (UCR) (Read/Write)
The UART Control Register controls and defines the protocol for asynchronous data communications,
including data length, stop bit, parity, and baud rate selection.
7 6 54 3 2 1 0
Data length select bit 0 (DLS0)
Data length select bit 1(DLS1)
Multiple stop bits enable (MSBE)
Parity bit enable (PBE)
Even parity enable (EPE)
Parity bit fixed enable (PBFE)
Set silence enable (SSE)
Baudrate divisor latch access bit (BDLAB)
Bit 7: BDLAB. When this bit is set to a logical 1, designers can access the divisor (in 16-bit binary
format) from the divisor latches of the baudrate generator during a read or write operation.
When this bit is reset, the Receiver Buffer Register, the Transmitter Buffer Register, or the
Interrupt Control Register can be accessed.
Bit 6: SSE. A logical 1 forces the Serial Output (SOUT) to a silent state (a logical 0). Only IRTX is
affected by this bit; the transmitter is not affected.
Bit 5: PBFE. When PBE and PBFE of UCR are both set to a logical 1,
(1) if EPE is logical 1, the parity bit is fixed as logical 0 to transmit and check.
(2) if EPE is logical 0, the parity bit is fixed as logical 1 to transmit and check.
Publication Release Date: April 1998
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Revision 0.52