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ST68C554 Folha de dados(PDF) 8 Page - Exar Corporation |
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ST68C554 Folha de dados(HTML) 8 Page - Exar Corporation |
8 / 40 page ST16C554/554D/68C554 8 Rev. 3.10 SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 68 64 type -RESET RESET 37 27 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 ST16C554D External Reset Conditions for ini- tialization 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 554D register selected by -CS and A0-A4 on the data bus, D0-D7, for transfer to an external CPU. -RXRDY 38 - O Receive Ready (active low) - This function is associated with 68 pin packages only. -RXRDY contains the wire OR- ed status of all four receive channel FIFOs, RXRDY A-D. A logic 0 indicates receive data ready status, i.e. the RHR is full or the FIFO has one or more RX characters available for unloading. This pin goes to a logic 1 when the FIFO/RHR is full or when there are no more characters available in either the FIFO or RHR. For 64/68 pin packages, individual channel RX status is read by examining individual internal registers via -CS and A0-A4 pin functions. -TXRDY 39 - O Transmit Ready (active low) - This function is associated with 68 pin package only. -TXRDY contains the wire OR- ed status of all four transmit channel FIFOs, TXRDY A-D. A logic 0 indicates a buffer ready status, i.e., at least one location is empty and available in one of the TX channels (A- D). This pin goes to a logic 1 when all four channels have no more empty locations in the TX FIFO or THR. VCC 13 4,21 VCC 47,64 35,52 I Power supply inputs. |
Nº de peça semelhante - ST68C554 |
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Descrição semelhante - ST68C554 |
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