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SC16C2550BIB48 数据表(PDF) 8 Page - NXP Semiconductors |
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SC16C2550BIB48 数据表(HTML) 8 Page - NXP Semiconductors |
8 / 42 page Philips Semiconductors SC16C2550B 5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs Product data Rev. 02 — 14 December 2004 8 of 42 9397 750 14449 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. XTAL2 17 19 14 O Output of the crystal oscillator or buffered clock. (See also XTAL1.) Crystal oscillator output or buffered clock output. Should be left open if an external clock is connected to XTAL1. For extended frequency operation, this pin should be tied to VCC via a 2 kΩ resistor. CDA, CDB 38, 19 42, 21 40, 16 I Carrier Detect (Active-LOW). These inputs are associated with individual UART channels A through B. A logic 0 on this pin indicates that a carrier has been detected by the modem for that channel. CTSA, CTSB 36, 25 40, 28 38, 23 I Clear to Send (Active-LOW). These inputs are associated with individual UART channels, A through B. A logic 0 on the CTS pin indicates the modem or data set is ready to accept transmit data from the SC16C2550B. Status can be tested by reading MSR[4]. This pin has no effect on the UART’s transmit or receive operation. DSRA, DSRB 37, 22 41, 25 39, 20 I Data Set Ready (Active-LOW). These inputs are associated with individual UART channels, A through B. A logic 0 on this pin indicates the modem or data set is powered-on and is ready for data exchange with the UART. This pin has no effect on the UART’s transmit or receive operation. DTRA, DTRB 33, 34 37, 38 34, 35 O Data Terminal REady (Active-LOW). These outputs are associated with individual UART channels, A through B. A logic 0 on this pin indicates that the SC16C2550B is powered-on and ready. This pin can be controlled via the modem control register. Writing a logic 1 to MCR[0] will set the DTR output to logic 0, enabling the modem. This pin will be a logic 1 after writing a logic 0 to MCR[0], or after a reset. This pin has no effect on the UART’s transmit or receive operation. RIA, RIB 39, 23 43, 26 41, 21 I Ring Indicator (Active-LOW). These inputs are associated with individual UART channels, A through B. A logic 0 on this pin indicates the modem has received a ringing signal from the telephone line. A logic 1 transition on this input pin will generate an interrupt. RTSA, RTSB 32, 24 36, 27 33, 22 O Request to Send (Active-LOW). These outputs are associated with individual UART channels, A through B. A logic 0 on the RTS pin indicates the transmitter has data ready and waiting to send. Writing a logic 1 in the modem control register MCR[1] will set this pin to a logic 0, indicating data is available. After a reset this pin will be set to a logic 1. This pin has no effect on the UART’s transmit or receive operation. RXA, RXB 10, 9 11, 10 5, 4 I Receive data A, B. These inputs are associated with individual serial channel data to the SC16C2550B receive input circuits, A-B. The RX signal will be a logic 1 during reset, idle (no data), or when the transmitter is disabled. During the local loop-back mode, the RX input pin is disabled and TX data is connected to the UART RX input, internally. TXA, TXB 11, 12 13, 14 7, 8 O Transmit data A, B. These outputs are associated with individual serial transmit channel data from the SC16C2550B. The TX signal will be a logic 1 during reset, idle (no data), or when the transmitter is disabled. During the local loop-back mode, the TX output pin is disabled and TX data is internally connected to the UART RX input. Table 2: Pin description…continued Symbol Pin Type Description DIP40 PLCC44 LQFP48 |
类似零件编号 - SC16C2550BIB48 |
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类似说明 - SC16C2550BIB48 |
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