xr16v794iv Exar Corporation, xr16v794iv Datasheet - Page 52

• Manufacturer Part Number: xr16v794iv
• Description: High Performance 2.25v To 3.6v Quad Uart With Fractional
• Manufacturer: Exar Corporation

XR16V794
HIGH PERFORMANCE 2.25V TO 3.6V QUAD UART WITH FRACTIONAL BAUD RATE
GENERAL DESCRIPTION ................................................................................................ 1
PIN DESCRIPTIONS ........................................................................................................ 3
1.0 DESCRIPTION ......................................................................................................................................... 6
2.0 FUNCTIONAL DESCRIPTIONS............................................................................................................... 6
3.0 XR16V794 REGISTERS ........................................................................................................................ 18
A
F
ORDERING INFORMATION
EATURES
PPLICATIONS
2.1 DEVICE RESET ................................................................................................................................................... 6
2.2 UART CHANNEL SELECTION............................................................................................................................ 6
2.3 SIMULTANEOUS WRITE TO ALL CHANNELS ................................................................................................. 6
2.4 INT# OUPUT ........................................................................................................................................................ 7
2.5 CRYSTAL OSCILLATOR / BUFFER................................................................................................................... 7
2.6 PROGRAMMABLE BAUD RATE GENERATOR WITH FRACTIONAL DIVISOR.............................................. 8
2.7 TRANSMITTER .................................................................................................................................................... 9
2.8 RECEIVER ......................................................................................................................................................... 11
2.9 THR AND RHR REGISTER LOCATIONS ......................................................................................................... 12
2.10 AUTO RTS/DTR HARDWARE FLOW CONTROL OPERATION.................................................................... 13
2.11 AUTO XON/XOFF (SOFTWARE) FLOW CONTROL...................................................................................... 14
2.12 SPECIAL CHARACTER DETECT .................................................................................................................. 15
2.13 AUTO RS485 HALF-DUPLEX CONTROL ..................................................................................................... 15
2.14 INFRARED MODE ........................................................................................................................................... 15
2.15 SLEEP MODE WITH AUTO WAKE-UP.......................................................................................................... 17
2.16 INTERNAL LOOPBACK .................................................................................................................................. 18
3.1
F
F
T
T
T
F
F
T
F
F
F
F
T
F
T
F
F
F
T
T
F
T
IGURE
IGURE
ABLE
ABLE
ABLE
IGURE
IGURE
ABLE
IGURE
IGURE
IGURE
IGURE
ABLE
IGURE
ABLE
IGURE
IGURE
IGURE
ABLE
ABLE
IGURE
ABLE
DEVICE CONFIGURATION REGISTER SET .................................................................................. 19
2.1.1 HARDWARE RESET....................................................................................................................................................... 6
2.1.2 SOFTWARE RESET ....................................................................................................................................................... 6
2.7.1 TRANSMIT HOLDING REGISTER (THR) - WRITE ONLY ........................................................................................... 10
2.7.2 TRANSMITTER OPERATION IN NON-FIFO MODE .................................................................................................... 10
2.7.3 TRANSMITTER OPERATION IN FIFO MODE ............................................................................................................. 10
2.8.1 RECEIVE HOLDING REGISTER (RHR) - READ-ONLY .............................................................................................. 11
2.10.1 AUTO CTS/DSR FLOW CONTROL............................................................................................................................ 13
3.1.1 THE GLOBAL INTERRUPT SOURCE REGISTERS.................................................................................................... 20
3.1.2 GENERAL PURPOSE 16-BIT TIMER/COUNTER [TIMERMSB, TIMELSB, TIMER, TIMECNTL] (DEFAULT 0XXX-XX-
1: UART C
2: INT# P
3: INT# P
4: T
5: T
6: A
7: XR16V794 R
8: D
9: UART C
1. B
2. P
3. T
4. B
5. T
6. T
7. R
8. R
9. A
10. I
11. I
12. T
13. T
3.1.1.1 INT0 C
3.1.1.2 INT1, INT2
00-00).............................................................................................................................................................................. 22
3.1.2.1 TIMERMSB [7:0]
.................................................................................................................................................... 1
YPICAL DATA RATES WITH A
RANSMIT AND
UTO
EVICE
YPICAL OSCILLATOR CONNECTIONS
RANSMITTER
RANSMITTER
LOCK
IN
AUD
ECEIVER
ECEIVER
UTO
NFRARED
NTERNAL
HE
HE
............................................................................................................................................... 1
O
X
UT OF THE
XR16V794 R
G
IN
IN
R
RTS/DTR
ON
C
D
HANNEL
HANNEL
LOBAL
ATE
ONFIGURATION
O
O
IAGRAM
/X
PERATION FOR
PERATION
O
O
L
OFF
T
G
PERATION IN NON
PERATION IN
EGISTER
OOP
RANSMIT
HANNEL
ENERATOR
R
O
O
I
................................................................................................................................ 2
NTERRUPT
ECEIVE
S
[7:0] I
PERATION IN NON
PERATION IN
(S
D
............................................................................................................................................................. 1
AND
ELECTION
B
AND
OFTWARE
EVICE
ACK
EGISTERS
F
S
CTS/DSR F
I
NTERRUPT
OR
D
NTERRUPT
INT3 I
ETS
H
................................................................................................................................................. 18
R
ATA
.................................................................................................................................................. 2
AND
................................................................................................................................................. 8
OLDING
FIFO
EGISTERS
T
R
R
RANSMITTER
ECEIVER
............................................................................................................................................ 19
24 MH
) F
EGISTERS
............................................................................................................................................. 6
E
FIFO
NTERRUPT
TIMERLSB [7:0] ............................................................................................................. 22
-FIFO M
........................................................................................................................................ 19
NCODING AND
LOW
AND
TABLE OF CONTENTS
S
R
-FIFO M
I
NDICATOR
LOW
OURCE
Z CRYSTAL OR EXTERNAL CLOCK AT
EGISTER
AND
................................................................................................................................. 7
C
A
............................................................................................................................... 20
................................................................................................................................ 7
ONTROL
, INT0, INT1, INT2
UTO
ODE
C
F
S
........................................................................................................................... 7
ONTROL
LOW
OURCE
E
ODE
RTS F
.................................................................................................................... 11
NCODING AND
L
: ................................................................................................................ 21
R
OCATIONS
ECEIVE
C
.............................................................................................................. 10
............................................................................................................... 15
ONTROL
LOW
L
O
OCATOR
PERATION
I
D
C
, 16C550
ATA
ONTROL
M
AND
C
ODE
........................................................................................... 21
LEARING
D
........................................................................................ 14
ECODING
INT3 .............................................................................. 21
..................................................................................... 10
M
COMPATIBLE
ODE
.............................................................................. 21
16X S
.......................................................................... 16
......................................................................... 12
AMPLING
............................................................... 12
..................................................... 9
REV. 1.0.0