AN10249 SC16C752/SC16C752B/ SC16C2550/SC16C2550B ISA bus hardware interface example

Transcription

1 INTEGRATED CIRCUITS ABSTRACT This application note shows how a SCC (or SCCB) or a SCC0 (or SCC0B) can be connected to an ISA bus. This application note is also applicable to all Philips SCC products. AN0 SCC/SCCB/ SCC0/SCC0B Author: Dong Nguyen Supersedes data of 00 Sep 0 00 Jun

2 SCC/SCCB/SCC0/SCC0B AN0 This application note shows how a SCC or a SCC0 can be connected to an ISA bus. The two channels of the UART are hardwired to the following addresses: CH A F F0 CH B F F0 Hardware interrupt for each channel can be selected by JP and JP. The following interrupts are supported: IRQ, IRQ, IR, IRQ, and IRQ. In an environment where the interrupt lines must be shared by other source, OPA or OPB can be used to drive a -State driver output enable. The input of this -State driver is connected to the UART s interrupt output, and the output of this -State is connected to the system s interrupt signal. This -State driver can be enabled/disabled by writing to MCR register bit. 00 Jun

3 SCC/SCCB/SCC0/SCC0B AN0 U /IOCK SD SD SD SD SD SD SD SD0 /IORDY AEN SA SA SA SA SA SA SA SA SA SA0 SA SA SA SA SA SA SA SA SA SA0 ISA A U RST +V IRQ V DRQ V OWS +V /SMEMW /SMEMR /IOW /IOR /DACK DRQ /DACK DRQ /REF CLK IRQ IRQ IRQ IRQ IRQ /DACK T/C BALE +V OSC ISA B SA SA SA0 SA SA SA SA SA SA SA V +V COM COM +V 0 UA LS0 UB LS0 UC LS0 UA LS00 JP 0 HEADER X JP 0 HEADER X U A A A A A A A A B B B B B B B B G DIR LS U A B C G GA GB LS Y0 Y Y Y Y Y Y Y SA[..0] D[..0] D D D D D D D D0 /IOR = 0 A <== B /IOR = A ==> B 0 COM COM Y = A*A*A*A*A*A*A = F F0 = COM Y = A*/A*A*A*A*A*A = F F0 = COM D[..0] C SA[..0] TRANSCEIVER Figure. SD00 00 Jun

4 AN0 SCC/SCCB/SCC0/SCC0B 00 Jun +V D0 D SA0 D RIB SA D D D D D SA D[..0] SA[..0] CDB JP + C 0uF C 0.uF C 0.0uF JP Y CRYSTAL R.K C pf C pf U SCC D D D D D0 TXRDYA D D D TXRDYB OPB XTAL XTAL CDB RXRDYB RIB OPA RXRDYA A0 A A N/C N/C N/C N/C SA[..0] D[..0] SD00 Figure.

5 AN0 SCC/SCCB/SCC0/SCC0B 00 Jun +V +V +V V +V +V V +V V +V V U MC0D 0 0 VDD RX TX RX TX RX TX VSS DO DI DO DI DO DI P CONNECTOR DB U MC0D 0 0 VDD RX TX RX TX RX TX VSS DO DI DO DI DO DI P CONNECTOR DB U0 MC0D 0 0 VDD RX TX RX TX RX TX VSS DO DI DO DI DO DI R K R K R K R M C 0.uF C 0.0uF + C 0uF + C 0uF C 0.0uF C0 0.uF + C 0uF C 0.0uF C 0.uF C 0.uF C 0.0uF + C 0uF C 0.uF + C 0uF C0 0.0uF JP CD DSR RX RTS TX CTS DTR RI DSR RX RTS TX CTS DTR Crystal can SD00 Figure.

6 SCC/SCCB/SCC0/SCC0B AN0 REVISION HISTORY Rev Date Description _ 000 ( 0 ). Supersedes data of 0 Sep 00 ( 0 ). Modifications: Added part-types SCCB and SCC0B to title. Abstract modified to include references to SCCB and SCC0B. _ 0000, initial version ( 0 ). Definitions Short-form specification The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 0). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Disclaimers Life support These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes Philips Semiconductors reserves the right to make changes in the products including circuits, standard cells, and/or software described or contained herein in order to improve design and/or performance. When the product is in full production (status Production ), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Contact information For additional information please visit Fax: + 0 For sales offices addresses send to: sales.addresses@ Koninklijke Philips Electronics N.V. 00 All rights reserved. Printed in U.S.A. Date of release: 0-0 Document order number: 0 00 Jun