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ST16C2450CJ44 데이터시트(PDF) 10 Page - Exar Corporation |
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ST16C2450CJ44 데이터시트(HTML) 10 Page - Exar Corporation |
10 / 30 page ST16C2450 xr 2.97V TO 5.5V DUART REV. 4.0.1 10 2.10 Internal Loopback The 2450 UART provides an internal loopback capability for system diagnostic purposes. The internal loopback mode is enabled by setting MCR register bit-4 to logic 1. All regular UART functions operate normally. Figure 7 shows how the modem port signals are re-configured. Transmit data from the transmit shift register output is internally routed to the receive shift register input allowing the system to receive the same data that it was sending. The TX pin is held at logic 1 or mark condition while RTS# and DTR# are de-asserted, and CTS#, DSR# CD# and RI# inputs are ignored. Caution: the RX input must be held to a logic 1 during loopback test else upon exiting the loopback test the UART may detect and report a false “break” signal. FIGURE 7. INTERNAL LOOP BACK IN CHANNELS A AND B TXA/TXB RXA/RXB RTSA#/RTSB# MCR bit-4=1 VCC VCC Transmit Shift Register (THR/FIFO) Receive Shift Register (RHR/FIFO) CTSA#/CTSB DTRA#/DTRB# DSRA#/DSRB# RIA#/RIB# CDA#/CDB# OP1# OP2# RTS# CTS# DTR# DSR# RI# CD# VCC OP2A#/OP2B# VCC |
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