xr16m680 Exar Corporation, xr16m680 Datasheet - Page 56

• Manufacturer Part Number: xr16m680
• Description: 1.62v To 3.63v High Performance Uart With 32-byte Fifo
• Manufacturer: Exar Corporation

REV. 1.0.0
GENERAL DESCRIPTION................................................................................................ 1
PIN DESCRIPTIONS ........................................................................................................ 4
1.0 PRODUCT DESCRIPTION ...................................................................................................................... 7
2.0 FUNCTIONAL DESCRIPTIONS .............................................................................................................. 8
3.0 UART INTERNAL REGISTERS............................................................................................................. 25
4.0 INTERNAL REGISTER DESCRIPTIONS .............................................................................................. 27
F
A
ORDERING INFORMATION
EATURES
PPLICATIONS
2.1 CPU INTERFACE ................................................................................................................................................ 8
2.2 SERIAL INTERFACE........................................................................................................................................... 9
2.3 DEVICE RESET ................................................................................................................................................. 11
2.4 INTERNAL REGISTERS.................................................................................................................................... 11
2.5 INT OUPUT ........................................................................................................................................................ 11
2.6 CRYSTAL OSCILLATOR OR EXTERNAL CLOCK INPUT.............................................................................. 12
2.7 PROGRAMMABLE BAUD RATE GENERATOR WITH FRACTIONAL DIVISOR ........................................... 13
2.8 TRANSMITTER.................................................................................................................................................. 15
2.9 RECEIVER ......................................................................................................................................................... 16
2.10 AUTO RTS (HARDWARE) FLOW CONTROL ................................................................................................ 18
2.11 AUTO RTS HYSTERESIS ............................................................................................................................... 18
2.12 AUTO CTS FLOW CONTROL......................................................................................................................... 18
2.13 AUTO XON/XOFF (SOFTWARE) FLOW CONTROL...................................................................................... 20
2.14 SPECIAL CHARACTER DETECT.................................................................................................................. 20
2.15 NORMAL MULTIDROP MODE........................................................................................................................ 20
2.16 INFRARED MODE ........................................................................................................................................... 21
2.17 SLEEP MODE WITH AUTO WAKE-UP AND POWER-SAVE FEATURE ...................................................... 22
2.18 INTERNAL LOOPBACK................................................................................................................................. 24
4.1 RECEIVE HOLDING REGISTER (RHR) - READ- ONLY .................................................................................. 27
4.2 TRANSMIT HOLDING REGISTER (THR) - WRITE-ONLY ............................................................................... 27
4.3 INTERRUPT ENABLE REGISTER (IER) - READ/WRITE ................................................................................ 27
F
F
F
F
F
F
T
T
F
F
T
F
F
F
F
T
F
T
F
F
T
T
IGURE
IGURE
IGURE
IGURE
IGURE
IGURE
ABLE
ABLE
IGURE
IGURE
ABLE
IGURE
IGURE
IGURE
IGURE
ABLE
IGURE
ABLE
IGURE
IGURE
ABLE
ABLE
2.7.1 INDEPENDENT TX/RX BRG......................................................................................................................................... 13
2.8.1 TRANSMIT HOLDING REGISTER (THR) - WRITE ONLY........................................................................................... 15
2.8.2 TRANSMITTER OPERATION IN NON-FIFO MODE .................................................................................................... 15
2.8.3 TRANSMITTER OPERATION IN FIFO MODE ............................................................................................................. 16
2.9.1 RECEIVE HOLDING REGISTER (RHR) - READ-ONLY .............................................................................................. 16
2.15.1 AUTO ADDRESS DETECTION .................................................................................................................................. 21
2.17.1 SLEEP MODE ............................................................................................................................................................. 22
2.17.2 POWER-SAVE FEATURE .......................................................................................................................................... 23
2.17.3 WAKE-UP INTERRUPT .............................................................................................................................................. 23
4.3.1 IER VERSUS RECEIVE FIFO INTERRUPT MODE OPERATION ............................................................................... 28
1: INT P
2: INT P
3: T
4: A
5: A
6: UART INTERNAL REGISTERS .................................................................................................................................. 25
7: INTERNAL REGISTERS DESCRIPTION. S
1. XR16M680 B
2. P
3. P
4. XR16M680 T
5. XR16M680 T
6. XR16M680 T
7. T
8. B
9. T
10. T
11. R
12. R
13. A
14. I
15. I
.................................................................................................................................................... 1
YPICAL DATA RATES WITH A
UTO
UTO
YPICAL
RANSMITTER
IN
IN
AUD
NFRARED
NTERNAL
RANSMITTER
UTO
ECEIVER
ECEIVER
.............................................................................................................................................. 1
O
O
IN
IN
RTS (H
X
UT
UT
R
ON
O
O
RTS
ATE
C
A
A
PERATION FOR
PERATION FOR
/X
RYSTAL
SSIGNMENT
SSIGNMENT
L
OFF
T
O
O
G
OOPBACK
ARDWARE
AND
RANSMIT
YPICAL
YPICAL
YPICAL
PERATION IN NON
PERATION IN
LOCK
ENERATOR
O
............................................................................................................................... 3
O
PERATION IN NON
(S
PERATION IN
CTS F
C
OFTWARE
D
ONNECTIONS
I
S
S
IAGRAM
NTEL
................................................................................................................................................... 24
D
F
F
) F
ERIAL
ERIAL
OR
OR
ATA
T
R
LOW
............................................................................................................................................... 14
LOW
RANSMITTER
ECEIVER
FIFO
/M
32-
25-
24 MH
) F
E
I
I
OTOROLA
C
.......................................................................................................................................... 1
NTERFACE
NTERFACE
NCODING AND
FIFO
C
-FIFO M
LOW
PIN
PIN
ONTROL
ONTROL
AND
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO
-FIFO M
.................................................................................................................................. 12
Z CRYSTAL OR EXTERNAL CLOCK AT
QFN
BGA P
................................................................................................................................ 11
C
AND
A
ONTROL
........................................................................................................................... 11
UTO
D
ODE
O
AND
C
C
........................................................................................................................ 18
ATA
F
PERATION
ACKAGE
ONNECTIONS
ONNECTIONS
ODE
LOW
RTS F
.................................................................................................................. 17
R
48-
B
HADED BITS ARE ENABLED WHEN
ECEIVE
.............................................................................................................. 15
............................................................................................................... 20
US
C
PIN
ONTROL
........................................................................................................... 3
I
LOW
NTERCONNECTIONS
....................................................................................................... 19
TQFP P
I
D
................................................................................................... 9
................................................................................................. 10
ATA
C
ONTROL
M
D
ODE
ACKAGES
ECODING
................................................................................... 16
M
ODE
............................................................................ 8
16X S
.......................................................................... 22
I
N
....................................................................... 17
16
AND
AMPLING
EFR B
68 M
IT
................................................... 14
ODE
-4=1 ......................................... 26
............................................. 2
XR16M680