SPI/I2C UART with 128-Word FIFOs RESUME are programmed in FlowLvl. With differin" />
參數(shù)資料
型號(hào)： MAX3107ETG+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 14/52頁(yè)
文件大小： 0K
描述： IC UART SPI/I2C 128 FIFO 24TQFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 86
特點(diǎn)： 內(nèi)部振蕩器
通道數(shù)： 4，QUART
FIFO's： 128 字節(jié)
規(guī)程： RS232，RS485
電源電壓： 2.35 V ~ 3.6 V
帶自動(dòng)流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
安裝類型： 表面貼裝
封裝/外殼： 24-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 24-TQFN-EP（3.5x3.5）
包裝： 管件
SPI/I2C UART with 128-Word FIFOs
RESUME are programmed in FlowLvl. With differing
HALT and RESUME levels, hysteresis can be defined for
the RTS/CLKOUT transitions.
When the RxFIFO fill level reaches the HALT level
(FlowLvl[3:0]), the MAX3107 deasserts RTS/CLKOUT.
RTS/CLKOUT remains deasserted until the RxFIFO is
emptied and the number of words falls to the RESUME
level.
Interrupts are not generated when the HALT and
RESUME levels are reached. This allows the host control-
ler to be completely disengaged from RTS flow control
management.
AutoCTS Control
When AutoCTS flow control is enabled, the UART auto-
matically starts transmitting data when the CTS input is
logic-level low and stops transmitting when CTS is logic-
high. This frees the host processor from managing this
timing-critical flow-control task. AutoCTS flow control is
enabled through FlowCtrl[1]: AutoCTS. During AutoCTS
flow control the CTS interrupt works normally. Set the
IRQEn[7]: CTSIntEn to 0 to disable CTS interrupts; then
ISR[7]: CTSInt is fixed to logic 0 and the host does not
receive interrupts from CTS. If CTS is set high during
transmission, the MAX3107 completes transmission of
the current word and halts transmission afterwards.
Turn the transmitter off by setting MODE1[1] to 1 before
enabling AutoCTS control.
Auto Software (XON/XOFF)
Flow Control
When auto software flow control is enabled, the MAX3107
recognizes and/or sends predefined XON/XOFF charac-
ters to control the flow of data across the asynchronous
serial link. Auto flow works autonomously and does not
involve host intervention, similar to auto hardware flow
control. To reduce the chance of receiving corrupted data
that equals a single-byte XON or XOFF character, the
MAX3107 allows for double-wide (16-bit) XON/XOFF char-
acters. XON and XOFF are programmed into the XON1,
XON2 and XOFF1, XOFF2 registers.
FlowCtrl[7:3] are used for enabling and configuring auto
software flow control. An ISR[1] interrupt is generated
when XON or XOFF are received and details are found in
SpclCharInt. The IRQ can be masked by setting IRQEn[1]:
SpclChrIEn to 0.
Software flow control consists of transmitter control and
receiver overflow control, which can operate indepen-
dently of each other.
Figure 12. Echo Suppression Timing
TX
RX
DI TO RO PROPAGATION DELAY
HOLD DELAY
STOP
BIT
RTS/CLKOUT
Maxim Integrated
21
MAX3107
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