Electronics America Network Cables User Manual

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Preliminary User’s Manual S15543EJ1V0UM
CHAPTER 8 UART
8.1 Overview
UART is a serial interface that conforms to the RS-232C communication standard and is equipped with two one-
channel interfaces, one for transmission and one for reception. This unit is functionally compatible with the
NS16550D.
8.2 UART Block Diagram
DATA
BUS
BUFFER
RECEIVER
BUFFER
REGISTER
LINE
CONTROL
REGISTER
DIVISOR
LATCH(LS)
DIVISOR
LATCH(MS)
LINE
STATUS
REGISTER
TRANSMITTER
HOLDING
REGISTER
MODEM
CONTROL
REGISTER
INT ERR UPT
ENABLE
REGISTER
INT ERR UPT
ID
REGISTER
FIFO
CONTROL
REGISTER
TRANSMITTER
SHIFT
REGISTER
TRANSMITTER
TIMING
CONTROL
RECEIVER
TIMING
CONTROL
RECEIVER
SHIFT
REGISTER
RECEIVER
FIFO
TRANSMITTER
FIFO
INT ERR UPT
CONTROL
LOGIC
MODEM
CONTROL
LOGIC
BAUD
GENERATOR
S
E
L
S
E
L
MODEM
CONTROL
REGISTER
URSDI
URCLK
URSDO
URRTS_B
URCTS_B
URDTR_B
URDSR_B
URDCD_B
INTPR
(to V
R
4120A)