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ST16C454 Scheda tecnica(PDF) 6 Page - Exar Corporation |
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ST16C454 Scheda tecnica(HTML) 6 Page - Exar Corporation |
6 / 30 page ST16C454/68C454 6 Rev. 3.20 under R/-W. -IRQ 15 O Interrupt Request or Interrupt A - This function is associated with the 68 mode only. In the 68 mode, interrupts from UART channels A-D are WIRE-ORed internally to function as a single IRQ interrupt. This pin transitions to a logic 0 (if enabled by the interrupt enable register) whenever a UART channel(s) requires service. Individual channel interrupt status can be determined by address- ing each channel through its associated internal register, using - CS and A3-A4. In the 68 mode an external pull-up resistor must be connected between this pin and VCC. The function of this pin changes to INTA when operating in the 16 mode, see definition under INTA. -RESET RESET 37 I Reset. - In the 16 mode 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 ST16C454 External Reset Conditions for initialization details.) When 16/-68 is a logic 0 (68 mode), this pin functions similarly but, as an inverted reset interface signal, -RESET. R/-W 18 I Read/Write Strobe (active low) - This function is associated with the 68 mode only. This pin provides the combined functions for Read or Write strobes. A logic 1 to 0 transition transfers the contents of the CPU data bus (D0-D7) to the register selected by -CS and A0-A4. Similarly a logic 0 to 1 transition places the contents of a 454 register selected by -CS and A0-A4 on the data bus, D0-D7, for transfer to an external CPU. VCC 13 VCC 47,64 I Power supply inputs. XTAL1 35 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 (see figure 8). Alternatively, an external clock can be connected to this pin to provide custom data rates (see Baud Rate Generator Program- ming). XTAL2 36 O Output of the Crystal Oscillator or Buffered Clock - (See also XTAL1). Crystal oscillator output or buffered clock output. Symbol Pin Signal Pin Description type SYMBOL DESCRIPTION |
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