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FDC37C669-MT Datasheet(PDF) 10 Page - Microchip Technology |
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FDC37C669-MT Datasheet(HTML) 10 Page - Microchip Technology |
10 / 162 page 10 DESCRIPTION OF PIN FUNCTIONS QFP/ TQFP PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 80,90 nData Set Ready nDSR1 nDSR2 I Active low Data Set Ready inputs for the serial port. Handshake signal which notifies the UART that the modem is ready to establish the communication link. The CPU can monitor the status of nDSR signal by reading bit 5 of Modem Status Register (MSR). A nDSR signal state change from low to high after the last MSR read will set MSR bit 1 to a 1. If bit 3 of Interrupt Enable Register is set, the interrupt is generated when nDSR changes state. Note: Bit 5 of MSR is the complement of nDSR. 85,87 nData Carrier Detect nDCD1 nDCD2 I Active low Data Carrier Detect inputs for the serial port. Handshake signal which notifies the UART that carrier signal is detected by the modem. The CPU can monitor the status of nDCD signal by reading bit 7 of Modem Status Register (MSR). A nDCD signal state change from low to high after the last MSR read will set MSR bit 3 to a 1. If bit 3 of Interrupt Enable Register is set, the interrupt is generated when nDCD changes state. Note: Bit 7 of MSR is the complement of nDCD. 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 |
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