NEC Network Controller uPD98502 - Manual (Page 414)

414 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
D A T A
B U S
B U F F E R
R E C E IV E R
B U F F E R
R E G IS T E R
L IN E
C O N T R O L
R E G IS T E R
D IV IS O R
L A T C H (L S )
D IV IS O R
L A T C H (M S )
L IN E
S T A T U S
R E G IS T E R
T R A N S M IT T E R
H O L D IN G
R E G IS T E R
M O D E M
C O N T R O L
R E G IS T E R
IN T E R R U P T
E N A B L E
R E G IS T E R
IN T E R R U P T
ID
R E G IS T E R
F IF O
C O N T R O L
R E G IS T E R
T R A N S M IT T E R
S H IF T
R E G IS T E R
T R A N S M IT T E R
T IM IN G
C O N T R O L
R E C E IV E R
T IM IN G
C O N T R O L
R E C E IV E R
S H IF T
R E G IS T E R
R E C E IV E R
F IF O
T R A N S M IT T E R
F IF O
IN T E R R U P T
C O N T R O L
L O G IC
M O D E M
C O N T R O L
L O G IC
B A U D
G E N E R A T O R
S
E
L
S
E
L
M O D E M
C O N T R O L
R E G IS T E R
U R S D I
U R C LK
U R S D O
U R R T S _B
U R C T S _B
U R D T R _B
U R D S R _B
U R D C D _B
IN T P R
(to V R 4120A )