參數(shù)資料
型號： XR16L580
廠商： Exar Corporation
英文描述： SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
中文描述： 2.25V至5.5V的最小的16字節(jié)FIFO和省電的UART
文件頁數(shù)： 22/47頁
文件大?。?/td> 285K
代理商： XR16L580
XR16L580
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
á
REV. 1.2.0
22
4.0
INTERNAL REGISTER DESCRIPTIONS
4.1
See “RECEIVER” on page 12.
4.2
Transmit Holding Register (THR) - Write-Only
See “Transmitter” on page 11.
4.3
Baud Rate Generator Divisors (DLL and DLM) - Read/Write
The Baud Rate Generator (BRG) is a 16-bit counter that generates the data rate for the transmitter. The rate is
programmed through registers DLL and DLM which are only accessible when LCR bit-7 is set to ‘1’.
See
“Programmable Baud Rate Generator” on page 9.
for more details.
4.4
Interrupt Enable Register (IER) - Read/Write
The Interrupt Enable Register (IER) masks the interrupts from receive data ready, transmit empty, line status
and modem status registers. These interrupts are reported in the Interrupt Status Register (ISR).
4.4.1
IER versus Receive FIFO Interrupt Mode Operation
When the receive FIFO (FCR BIT-0 = 1) and receive interrupts (IER BIT-0 = 1) are enabled, the RHR interrupts
(see ISR bits 2 and 3) status will reflect the following:
A.
The receive data available interrupts are issued to the host when the FIFO has reached the programmed
trigger level. It will be cleared when the FIFO drops below the programmed trigger level.
B.
FIFO level will be reflected in the ISR register when the FIFO trigger level is reached. Both the ISR register
status bit and the interrupt will be cleared when the FIFO drops below the trigger level.
C.
The receive data ready bit (LSR BIT-0) is set as soon as a character is transferred from the shift register to
the receive FIFO. It is reset when the FIFO is empty.
4.4.2
IER versus Receive/Transmit FIFO Polled Mode Operation
When FCR bit-0 equals a logic 1 for FIFO enable; resetting IER bits 0-3 enables the XR16L580 in the FIFO
polled mode of operation. Since the receiver and transmitter have separate bits in the LSR either or both can
be used in the polled mode by selecting respective transmit or receive control bit(s).
A.
LSR BIT-0 indicates there is data in RHR
or
RX FIFO.
B.
LSR BIT-1 indicates an overrun error has occurred and that data in the FIFO may not be valid.
C.
LSR BIT 2-4 provides the type of receive data errors encountered for the data byte in RHR, if any.
D.
LSR BIT-5 indicates THR is empty.
E.
LSR BIT-6 indicates when both the transmit FIFO and TSR are empty.
Receive Holding Register (RHR) - Read- Only
Enhanced Registers
0 1 0
EFR
RD/WR
Auto
CTS
Enable
Auto
RTS
Enable
Special
Char
Select
Enable
IER [7:4],
ISR [5:4],
FCR[5:4],
MCR[7:5],
MCR[2]
Soft-
ware
Flow
Cntl
Bit-3
Soft-
ware
Flow
Cntl
Bit-2
Soft-
ware
Flow
Cntl
Bit-1
Soft-
ware
Flow
Cntl
Bit-0
LCR=0
X
BF
1 0 0
XON1
WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
1 0 1
XON2
WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
1 1 0
XOFF1
WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
1 1 1
XOFF2
WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
T
ABLE
6: INTERNAL REGISTERS DESCRIPTION.
S
HADED
BITS
ARE
ENABLED
WHEN
EFR B
IT
-4=1
A
DDRESS
A2-A0
R
EG
N
AME
R
EAD
/
W
RITE
B
IT
-7
B
IT
-6
B
IT
-5
B
IT
-4
B
IT
-3
B
IT
-2
B
IT
-1
B
IT
-0
C
OMMENT
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參數(shù)描述
XR16L580_07 制造商:EXAR 制造商全稱:EXAR 功能描述:SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
XR16L580IL 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR16L580IL-0A-EVB 功能描述:UART 接口集成電路 Supports L580 32 pin QFN, ISA Interface RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR16L580IL-0B-EVB 功能描述:UART 接口集成電路 Supports L580 32 pin QFN, PCI Interface RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR16L580IL24 功能描述:UART 接口集成電路 UART w/ POWER SAVE RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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