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TL16C550CFNG4 Folha de dados(PDF) 6 Page - Texas Instruments |
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TL16C550CFNG4 Folha de dados(HTML) 6 Page - Texas Instruments |
6 / 43 page TL16C550C, TL16C550CI ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH AUTOFLOW CONTROL SLLS177H − MARCH 1994 − REVISED JANUARY 2006 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL NAME NO. N† NO. FN NO. PT I/O DESCRIPTION A0 A1 A2 28 27 26 31 30 29 28 27 26 I Register select. A0 − A2 are used during read and write operations to select the ACE register to read from or write to. Refer to Table 1 for register addresses and refer to ADS description. ADS 25 28 24 I Address strobe. When ADS is active (low), A0, A1, and A2 and CS0, CS1, and CS2 drive the internal select logic directly; when ADS is high, the register select and chip select signals are held at the logic levels they were in when the low-to-high transition of ADS occurred. BAUDOUT 15 17 12 O Baud out. BAUDOUT is a 16 × clock signal for the transmitter section of the ACE. The clock rate is established by the reference oscillator frequency divided by a divisor specified by the baud generator divisor latches. BAUDOUT may also be used for the receiver section by tying this output to RCLK. CS0 CS1 CS2 12 13 14 14 15 16 9 10 11 I Chip select. When CS0 and CS1 are high and CS2 is low, these three inputs select the ACE. When any of these inputs are inactive, the ACE remains inactive (refer to ADS description). CTS 36 40 38 I Clear to send. CTS is a modem status signal. Its condition can be checked by reading bit 4 (CTS) of the modem status register. Bit 0 ( ∆CTS) of the modem status register indicates that CTS has changed states since the last read from the modem status register. If the modem status interrupt is enabled when CTS changes levels and the auto-CTS mode is not enabled, an interrupt is generated. CTS is also used in the auto-CTS mode to control the transmitter. D0 D1 D2 D3 D4 D5 D6 D7 1 2 3 4 5 6 7 8 2 3 4 5 6 7 8 9 43 44 45 46 47 2 3 4 I/O Data bus. Eight data lines with 3-state outputs provide a bidirectional path for data, control, and status information between the ACE and the CPU. DCD 38 42 40 I Data carrier detect. DCD is a modem status signal. Its condition can be checked by reading bit 7 (DCD) of the modem status register. Bit 3 ( ∆DCD) of the modem status register indicates that DCD has changed states since the last read from the modem status register. If the modem status interrupt is enabled when DCD changes levels, an interrupt is generated. DDIS 23 26 22 O Driver disable. DDIS is active (high) when the CPU is not reading data. When active, DDIS can disable an external transceiver. DSR 37 41 39 I Data set ready. DSR is a modem status signal. Its condition can be checked by reading bit 5 (DSR) of the modem status register. Bit 1 ( ∆DSR) of the modem status register indicates DSR has changed levels since the last read from the modem status register. If the modem status interrupt is enabled when DSR changes levels, an interrupt is generated. DTR 33 37 33 O Data terminal ready. When active (low), DTR informs a modem or data set that the ACE is ready to establish communication. DTR is placed in the active level by setting the DTR bit of the modem control register. DTR is placed in the inactive level either as a result of a master reset, during loop mode operation, or clearing the DTR bit. INTRPT 30 33 30 O Interrupt. When active (high), INTRPT informs the CPU that the ACE has an interrupt to be serviced. Four conditions that cause an interrupt to be issued are: a receiver error, received data that is available or timed out (FIFO mode only), an empty transmitter holding register, or an enabled modem status interrupt. INTRPT is reset (deactivated) either when the interrupt is serviced or as a result of a master reset. MR 35 39 35 I Master reset. When active (high), MR clears most ACE registers and sets the levels of various output signals (refer to Table 2). The N package is Not Recommended for New Designs. |
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