 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
SC16C2550 Datasheet(PDF) 12 Page - NXP Semiconductors |
|
|
|||||||||||||||||||||||||||||
SC16C2550 Datasheet(HTML) 12 Page - NXP Semiconductors |
|
|
12 / 46 page  Philips Semiconductors SC16C2550 Dual UART with 16 bytes of transmit and receive FIFOs and IrDA encoder/decoder Product data Rev. 03 — 19 June 2003 12 of 46 9397 750 11621 © Koninklijke Philips Electronics N.V. 2003. All rights reserved. the SC16C2550 compares two consecutive receive characters with two software flow control 8-bit values (Xon1, Xon2, Xoff1, Xoff2) and controls TX transmissions accordingly. Under the above described flow control mechanisms, flow control characters are not placed (stacked) in the user accessible RX data buffer or FIFO. In the event that the receive buffer is overfilling and flow control needs to be executed, the SC16C2550 automatically sends an Xoff message (when enabled) via the serial TX output to the remote modem. The SC16C2550 sends the Xoff1,2 characters as soon as received data passes the programmed trigger level. To clear this condition, the SC16C2550 will transmit the programmed Xon1,2 characters as soon as receive data drops below the programmed trigger level. 6.6 Special feature software flow control A special feature is provided to detect an 8-bit character when EFR[5] is set. When 8-bit character is detected, it will be placed on the user-accessible data stack along with normal incoming RX data. This condition is selected in conjunction with EFR[0-3]. Note that software flow control should be turned off when using this special mode by setting EFR[0-3] to a logic 0. The SC16C2550 compares each incoming receive character with Xoff2 data. If a match exists, the received data will be transferred to the FIFO, and ISR[4] will be set to indicate detection of a special character. Although the Internal Register Table (Table 7) shows each X-Register with eight bits of character information, the actual number of bits is dependent on the programmed word length. Line Control Register bits LCR[0-1] define the number of character bits, i.e., either 5 bits, 6 bits, 7 bits or 8 bits. The word length selected by LCR[0-1] also determine the number of bits that will be used for the special character comparison. Bit 0 in the X-registers corresponds with the LSB bit for the receive character. 6.7 Hardware/software and time-out interrupts The interrupts are enabled by IER[0-3]. Care must be taken when handling these interrupts. Following a reset, if Interrupt Enable Register (IER) bit 1 = 1, the SC16C2550 will issue a Transmit Holding Register interrupt. This interrupt must be serviced prior to continuing operations. The LSR register provides the current singular highest priority interrupt only. It could be noted that CTS and RTS interrupts have lowest interrupt priority. A condition can exist where a higher priority interrupt may mask the lower priority CTS/RTS interrupt(s). Only after servicing the higher pending interrupt will the lower priority CTS/RTS interrupt(s) be reflected in the status register. Servicing the interrupt without investigating further interrupt conditions can result in data errors. When two interrupt conditions have the same priority, it is important to service these interrupts correctly. Receive Data Ready and Receive Time Out have the same interrupt priority (when enabled by IER[3]). The receiver issues an interrupt after the number of characters have reached the programmed trigger level. In this case, the SC16C2550 FIFO may hold more characters than the programmed trigger level. Following the removal of a data byte, the user should re-check LSR[0] for additional characters. A Receive Time Out will not occur if the receive FIFO is empty. The time-out counter is reset at the center of each stop bit received or each time the |
Similar Part No. - SC16C2550 |
|
Similar Description - SC16C2550 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
