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FDC37C669 Datasheet(PDF) 11 Page - SMSC Corporation |
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FDC37C669 Datasheet(HTML) 11 Page - SMSC Corporation |
11 / 164 page 11 DESCRIPTION OF PIN FUNCTIONS QFP/ TQFP PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 84,86 nRing Indicator nRI1 nRI2 I Active low Ring Indicator inputs for the serial port. Handshake signal which notifies the UART that the telephone ring signal is detected by the modem. The CPU can monitor the status of nRI signal by reading bit 6 of Modem Status Register (MSR). A nRI signal state change from low to high after the last MSR read will set MSR bit 2 to a 1. If bit 3 of Interrupt Enable Register is set, the interrupt is generated when nRI changes state. Note: Bit 6 of MSR is the complement of nRI. PARALLEL PORT INTERFACE 73 nPrinter Select Input nSLCTIN OD24 0P24 This active low output selects the printer. This is the complement of bit 3 of the Printer Control Register. Refer to Parallel Port description for use of this pin in ECP and EPP mode. 74 nInitiate Output nINIT OD24 0P24 This output is bit 2 of the printer control register. This is used to initiate the printer when low. Refer to Parallel Port description for use of this pin in ECP and EPP mode. 76 nAutofeed Output nAUTOFD OD24 0P24 This output goes low to cause the printer to automatically feed one line after each line is printed. The nAUTOFD output is the complement of bit 1 of the Printer Control Register. Refer to Parallel Port description for use of this pin in ECP and EPP mode. |
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