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TL16C2550IRHBRG4 Datenblatt(PDF) 5 Page - Texas Instruments |
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TL16C2550IRHBRG4 Datenblatt(HTML) 5 Page - Texas Instruments |
5 / 47 page www.ti.com Detailed Description Autoflow Control (see Figure 1) TL16C2550 SLWS161D – JUNE 2005 – REVISED OCTOBER 2006 DEVICE INFORMATION (continued) TERMINAL FUNCTIONS (continued) TERMINAL I/O DESCRIPTION NAME PFB NO. FN NO. RHB NO. Ring indicator (active low). These inputs are associated with individual UART channels A and B. A logic low on these pins indicates the modem has received a ringing signal from the telephone line. A low to high RIA, RIB 41, 21 43, 26 – I transition on these input pins generates a modem status interrupt, if enabled. The state of these inputs is reflected in the modem status register (MSR) Request to send (active low). These outputs are associated with individual UART channels A and B. A low on the RTS pin indicates the transmitter has data ready and waiting to send. Writing a 1 in the modem control RTSA, register (MCR bit 1) sets these pins to low, indicating data is available. 33, 22 36, 27 23, 15 O RTSB After a reset, these pins are set to high. These pins only affects the transmit and receive operation when auto RTS function is enabled through the enhanced feature register (EFR) bit 6, for hardware flow control operation. Receive data input. These inputs are associated with individual serial channel data to the 2550. During the local loopback mode, these RX input RXA, RXB 5, 4 11, 10 4, 3 I pins are disabled and TX data is internally connected to the UART RX input internally. Receive ready (active low). RXRDY A and B goes low when the trigger RXRDYA, 31, 18 34, 23 – O level has been reached or a timeout interrupt occurs. They go high when RXRDYB the RX FIFO is empty or there is an error in RX FIFO. Transmit data. These outputs are associated with individual serial transmit TXA, TXB 7, 8 13, 14 5, 6 O channel data from the 2550. During the local loopback mode, the TX input pin is disabled and TX data is internally connected to the UART RX input. Transmit ready (active low). TXRDY A and B go low when there are at least TXRDYA, 43, 6 1, 12 – O a trigger level numbers of spaces available. They go high when the TX TXRDYB buffer is full. VCC 42 44 26 I Power supply inputs. Crystal or external clock input. XTAL1 functions as a crystal input or as an external clock input. A crystal can be connected between XTAL1 and XTAL1 13 18 10 I XTAL2 to form an internal oscillator circuit (see Figure 14). Alternatively, an external clock can be connected to XTAL1 to provide custom data rates. Output of the crystal oscillator or buffered clock. See also XTAL1. XTAL2 is XTAL2 14 19 11 O used as a crystal oscillator output or buffered a clock output. Autoflow control is comprised of auto-CTS and auto-RTS. With auto-CTS, the CTS input must be active before the transmitter FIFO can emit data. With auto-RTS, RTS becomes active when the receiver needs more data and notifies the sending serial device. When RTS is connected to CTS, data transmission does not occur unless the receiver FIFO has space for the data; thus, overrun errors are eliminated using ACE1 and ACE2 from a TLC16C2550 with the autoflow control enabled. If not, overrun errors occur when the transmit data rate exceeds the receiver FIFO read latency. 5 Submit Documentation Feedback |
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