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16C450 Datasheet(PDF) 7 Page - Exar Corporation |
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16C450 Datasheet(HTML) 7 Page - Exar Corporation |
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7 / 28 page  ST16C450 7 Rev. 4.20 -RI 39 43 41 I Ring Indicator (active low) - 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. -RTS 32 36 32 O Request to Send (active low) - 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 bit-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. RX 10 11 7 I Receive Data - This pin provides the serial receive data input to the ST16C450. The RX signal will be a logic 1 during reset, idle (no data). During the local loop-back mode, the RX input pin is disabled and TX data is internally connected to the UART RX Input, internally, see figure 12. TX 11 13 8 O Transmit Data - This pin provides the serial transmit data from the ST16C450, the TX signal will be a logic 1 during reset, idle (no data). During the local loop-back mode, the TX input pin is disabled and TX data is internally connected to the UART RX Input, see figure 12. GENERAL DESCRIPTION The ST16C450 provides serial asynchronous receive data synchronization, parallel-to-serial and serial-to- parallel data conversions for both the transmitter and receiver sections. These functions are necessary for converting the serial data stream into parallel data that is required with digital data systems. Synchronization for the serial data stream is accomplished by adding start and stops bits to the transmit data to form a data character (character orientated protocol). Data integ- rity is insured by attaching a parity bit to the data character. The parity bit is checked by the receiver for any transmission bit errors. The electronic circuitry to provide all these functions is fairly complex especially when manufactured on a single integrated silicon chip. The ST16C450 represents such an integration with greatly enhanced features. The ST16C450 is fabricated with an advanced CMOS process. The ST16C450 is designed to work with high speed modems and shared network environments. The ST16C450 is capable of operation to 1.5Mbps with a 24 MHz crystal or external clock input. With a crystal of 14.7464 MHz and through a software option, the user can select data rates up to 460.8Kbps or 921.6Kbps. SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 40 44 48 type |
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