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ST16C550CP40 Datasheet(PDF) 6 Page - Exar Corporation |
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ST16C550CP40 Datasheet(HTML) 6 Page - Exar Corporation |
6 / 35 page ST16C550 6 Rev. 4.30 Symbol Pin Signal Pin Description 40 44 48 type SYMBOL DESCRIPTION -DDIS 23 26 22 O Drive Disable. This pin goes to a logic 0 when the external CPU is reading data from the ST16C550. This signal can be used to disable external transceivers or other logic func- tions. -OP1 34 38 34 O Output-1 (User Defined) - See bit-2 of modem control register (MCR bit-2). RESET 35 39 35 I Reset. (active high) - A logic 1 on this pin will reset the internal registers and all the outputs. The UART transmitter output and the receiver input will be disabled during reset time. (See ST16C550 External Reset Conditions for initial- ization details.) RCLK 9 10 5 I Receive Clock Input. This pin is used as external 16X clock input to the receiver section. External connection to - Baudout pin is required in order to utilize the internal baud rate generator. -OP2 31 35 31 O Output-2 (User Defined). This pin provides the user a general purpose output. See bit-3 modem control register (MCR bit-3). VCC 40 44 42 Pwr Power Supply Input. XTAL1 16 18 14 I Crystal or External Clock Input - Functions as a crystal input or as an external clock input. A crystal can be connected between this pin and XTAL2 to form an internal oscillator circuit. An external 1 M Ω resistor is required between the XTAL1 and XTAL2 pins (see figure 3). Alternatively, an external clock can be connected to this pin to provide custom data rates (Programming Baud Rate Generator section). XTAL2 17 19 15 O Output of the Crystal Oscillator or Buffered Clock - (See also XTAL1). Crystal oscillator output or buffered clock output. -CD 38 42 40 I Carrier Detect (active low) - A logic 0 on this pin indicates that a carrier has been detected by the modem. |
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