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参数资料
型号： XR16M564IV-0A-EVB
厂商： Exar Corporation
文件页数： 4/55页
文件大小： 0K
描述： EVAL BOARD FOR XR16M564-A 64LQFP
标准包装： 1
系列： *
XR16M564/564D
12
1.62V TO 3.63V QUAD UART WITH 32-BYTE FIFO
REV. 1.0.0
2.4
Channels A-D Internal Registers
Each UART channel in the M564 has a set of enhanced registers for controlling, monitoring and data loading
and unloading. The configuration register set is compatible to those already available in the standard single
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/DLD), and a
user accessible scratchpad register (SPR).
Beyond the general 16C550 features and capabilities, the M564 offers enhanced feature registers (EFR, Xon/
Xoff 1, Xon/Xoff 2)
that provide automatic RTS and CTS hardware flow control and automatic Xon/Xoff
software flow control.
All the register functions are discussed in full detail later
in “Section 3.0, UART
INTERNAL REGISTERS” on page 24.
2.5
INT Ouputs for Channels A-D
The interrupt outputs change according to the operating mode and enhanced features setup. Table 3 and 4
summarize the operating behavior for the transmitter and receiver. Also see Figure 20 through 25.
2.6
DMA Mode
The device does not support direct memory access. The DMA Mode (a legacy term) in this document does not
mean “direct memory access” but refers to data block transfer operation. The DMA mode affects the state of
the RXRDY# A-D and TXRDY# A-D output pins. The transmit and receive FIFO trigger levels provide
additional flexibility to the user for block mode operation. The LSR bits 5-6 provide an indication when the
transmitter is empty or has an empty location(s) for more data. The user can optionally operate the transmit
and receive FIFO in the DMA mode (FCR bit-3 = 1). When the transmit and receive FIFOs are enabled and the
DMA mode is disabled (FCR bit-3 = 0), the M564 is placed in single-character mode for data transmit or
receive operation. When DMA mode is enabled (FCR bit-3 = 1), the user takes advantage of block mode
TABLE 3: INT PIN OPERATION FOR TRANSMITTER FOR CHANNELS A-D
FCR BIT-0 = 0
(FIFO DISABLED)
FCR BIT-0 = 1 (FIFO ENABLED)
FCR Bit-3 = 0
(DMA Mode Disabled)
FCR Bit-3 = 1
(DMA Mode Enabled)
INT Pin
LOW = a byte in THR
HIGH = THR empty
LOW = FIFO above trigger level
HIGH = FIFO below trigger level or
FIFO empty
LOW = FIFO above trigger level
HIGH = FIFO below trigger level or
FIFO empty
TABLE 4: INT PIN OPERATION FOR RECEIVER FOR CHANNELS A-D
FCR BIT-0 = 0
(FIFO DISABLED)
FCR BIT-0 = 1 (FIFO ENABLED)
FCR Bit-3 = 0
(DMA Mode Disabled)
FCR Bit-3 = 1
(DMA Mode Enabled)
INT Pin
LOW = no data
HIGH = 1 byte
LOW = FIFO below trigger level
HIGH = FIFO above trigger level
LOW = FIFO below trigger level
HIGH = FIFO above trigger level
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XR16M564IV-0B-EVB 功能描述:界面开发工具 Eval Board for XR16M564IV-0B RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V
XR16M564IV64 制造商:EXAR 制造商全称:EXAR 功能描述:1.62V TO 3.63V QUAD UART WITH 32-BYTE FIFO
XR16M564IV64-F 功能描述:UART 接口集成电路 UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel
XR16M564IV80 制造商:EXAR 制造商全称:EXAR 功能描述:1.62V TO 3.63V QUAD UART WITH 32-BYTE FIFO
XR16M564IV80-0A-EB 功能描述:界面开发工具 Eval Board for XR16M564IV80-0A RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V
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