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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST162552 датащи(PDF) 5 Page - Exar Corporation |
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ST162552 датащи(HTML) 5 Page - Exar Corporation |
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5 / 28 page  3-139 ST16C2552 Symbol Pin Signal Type Pin Description SYMBOL DESCRIPTION CTS* A/B 40,28 I Clear to send A/B (active low). The CTS* signal is a MODEM control function input whose conditions can be tested by reading the MSR BIT-4. CTS* has no effect on the transmit or receive operation. DSR* A/B 41,29 I Data set ready A/B (active low). A low on this pin indicates the MODEM is ready to exchange data with UART. This pin does not have any effect on the transmit or receive opera- tion. CD* A/B 42,30 I Carrier detect A/B (active low). A low on this pin indicates the carrier has been detected by the modem. RI* A/B 43,31 I Ring detect indicator A/B (active low). A low on this pin indicates the modem has received a ringing signal from telephone line. VCC 33,44 I Power supply input. GND 12,22 O Signal and power ground. PROGRAMMING TABLE A2 A1 A0 READ MODE WRITE MODE 0 0 0 Receive Holding Register Transmit Holding Register 0 0 1 Interrupt Enable Register 0 1 0 Interrupt Status Register FIFO Control Register 0 1 1 Line Control Register 1 0 0 Modem Control Register 1 0 1 Line Status Register 1 1 0 Modem Status Register 1 1 1 Scratchpad Register Scratchpad Register 0 0 0 LSB of Divisor Latch 0 0 1 MSB of Divisor Latch 0 1 0 Alternate Function Register Alternate Function Register |
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