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XR21B1411IL16TR-F Datasheet(PDF) 8 Page - Exar Corporation |
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XR21B1411IL16TR-F Datasheet(HTML) 8 Page - Exar Corporation |
8 / 30 page XR21B1411 8 ENHANCED 1-CH FULL-SPEED USB UART REV. 1.2.0 1.3.5.1 Automatic RTS/CTS Hardware Flow Control GPIO5 and GPIO4 of the UART channel can be enabled as the RTS# and CTS# signals for Auto RTS/CTS flow control when GPIO_MODE[2:0] = ’001’. Automatic RTS flow control is used to prevent data overrun errors in local RX FIFO by de-asserting the RTS signal to the remote UART. When there is room in the RX FIFO, the RTS pin will be re-asserted. Automatic CTS flow control is used to prevent data overrun to the remote RX FIFO. The CTS# input is monitored to suspend/restart the local transmitter (refer to Figure 5): FIGURE 5. AUTO RTS AND CTS FLOW CONTROL OPERATION T r a n s m i tte r A u to C T S M oni t o r R e c e iv e r FI FO T r i gg er R eac hed A u to R T S T r i gge r Lev el Re m o t e UA RT UA R T B RT S A # CT S B # TX B RX A ON ON OF F ON ON OF F 1 2 3 4 1) C O M po r t ope ned , R X F I F O em p t y , R T S A # out put i s as s er t ed 2) S ignal pr opa gat ed t o C T S B # i np ut 3 ) D a ta b y te s e n te r T X F IF O , b e g i n tr a n s m i tti n g o n T X B 4) D a t a pr op agat es t o R e c ei v i ng dev ic e R X A 5) R X F I F O r ea c hes t hr e s hold 6) R T S A # d e - as s er t s 7) S ignal pr opa gat es t o C T S B # i np ut 8) T r ans m i s s i on s t op s on T X B 9) U S B B ul k - I n em pt i e s R X F I F O bel o w t hr es h ol d , R T S A # i s as s er t ed 10 ) S ignal pr opa gat ed t o C T S B # i np ut 11 ) D a t a by t es r e s um e t r an s m i t t i ng on T X B 5 6 7 8 9 10 11 RT S A # C T S B # TX B RX A C T SA# TX A R T SB# RX B R e c e iv e r FI FO T r i gg er R eac hed A u to R T S T r i gge r Lev el T r a n s m i tte r A u to C T S M oni t o r L o c a l UA RT UA R T A 1.3.5.2 Automatic DTR/DSR Hardware Flow Control Auto DTR/DSR hardware flow control behaves the same as the Auto RTS/CTS hardware flow control described above except that it uses the DTR# and DSR# signals. GPIO3 and GPIO2 become DTR# and DSR#, respectively, when GPIO_MODE[2:0] = ’010’ and FLOW_CONTROL[2:0] = ’001’. 1.3.5.3 Automatic XON/XOFF Software Flow Control When software flow control is enabled, the B1411 compares the receive data characters with the programmed Xon or Xoff characters. If the received character matches the programmed Xoff character, the B1411 will halt transmission as soon as the current character has completed transmission. Data transmission is resumed when a received character matches the Xon character. Software flow control is enabled when FLOW_CONTROL[2:0] = ’010’. 1.3.6 Auto RS-485 Half-Duplex Control The Auto RS-485 Half-Duplex Control feature changes the behavior of the GPIO5/RTS#/RS485 pin when enabled by the GPIO_MODE register bits 2-0. See ”Section 3.1.1.13, GPIO_MODE Register Description (Read / Write)” on page 18. The FLOW_CONTROL register must also be set appropriately for use in |
Similar Part No. - XR21B1411IL16TR-F |
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Similar Description - XR21B1411IL16TR-F |
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