參數(shù)資料
型號(hào)： 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(yè)數(shù)： 7/47頁(yè)
文件大?。?/td> 285K
代理商： XR16L580
á
REV. 1.2.0
XR16L580
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
7
2.2
The L580 can accept up to 5V inputs when operating at 3.3V or 2.5V. But note that if the L580 is operating at
2.5V, its V
OH
may not be high enough to meet the requirements of the V
IH
of a CPU or a serial transceiver that
is operating at 5V. Note that the XTAL1 pin is not 5V tolerant when external clock supply is used.
2.3
Device Hardware Reset
The RESET or RESET# input resets the internal registers and the serial interface outputs in both channels to
their default state (see
Table 11
). An active pulse of longer than 40 ns duration will be required to activate the
reset function in the device.
2.4
Device Identification and Revision
The XR16L580 provides a Device Identification code and a Device Revision code to distinguish the part from
other devices and revisions. To read the identification code from the part, it is required to set the baud rate
generator registers DLL and DLM both to 0x00. Now reading the content of the DLM will provide 0x01 to
indicate XR16L580 and reading the content of DLL will provide the revision of the part; for example, a reading
of 0x01 means revision A.
2.5
Internal Registers
The L580 has a set of enhanced registers for control, monitoring and data loading and unloading. The
configuration register set is compatible to those already available in the standard 16C550. These registers
function as data holding registers (THR/RHR), interrupt status and control registers (ISR/IER), a FIFO control
register (FCR), receive line status and control registers, (LSR/LCR), modem status and control registers (MSR/
MCR), programmable data rate (clock) divisor registers (DLL/DLM), and an user accessible Scratchpad
register (SPR).
Beyond the general 16C550 features and capabilities, the L580 offers enhanced feature registers (EFR, Xon1,
Xoff 1, Xon1 and Xoff2) that provide automatic RTS and CTS hardware flow control and Xon/Xoff software flow
control. All the register functions are discussed in full detail later in
“Section 3.0, UART INTERNAL
REGISTERS” on page 20
.
2.6
DMA Mode
The DMA Mode (a legacy term) refers to data block transfer operation. The DMA mode affects the state of the
RXRDY# and TXRDY# output pins available in the original 16C550. These pins are not available in the
XR16L580. The DMA Enable bit (FCR bit-3) does not have any function in this device and can be a ’0’ or a ’1’.
2.7
INT (IRQ#) Output
The interrupt output changes according to the operating mode and enhanced features setup.
Table 1
and
Table 2
below summarize the operating behavior for the transmitter and receiver in the Intel and Motorola
modes. Also see Figures
20
through
23
.
5-Volt Tolerant Inputs
T
ABLE
1: INT (IRQ#) P
IN
O
PERATION
FOR
T
RANSMITTER
FCR B
IT
-0 = 0 (FIFO D
ISABLED
)
FCR B
IT
-0 = 1 (FIFO E
NABLED
)
INT Pin
(16/68# = 1)
0 = one byte in THR
1 = THR empty
0 = FIFO above trigger level
1 = FIFO below trigger level or FIFO empty
IRQ# Pin
(16/68# = 0)
1 = one byte in THR
0 = THR empty
1 = FIFO above trigger level
0 = FIFO below trigger level or FIFO empty
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相關(guān)代理商/技術(shù)參數(shù)
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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