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ST16C554DIJ68 Scheda tecnica(PDF) 8 Page - Exar Corporation |
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ST16C554DIJ68 Scheda tecnica(HTML) 8 Page - Exar Corporation |
8 / 39 page ST16C554/554D 8 2.97V TO 5.5V QUAD UART WITH 16-BYTE FIFO REV. 4.0.1 2.2 Device Reset The RESET input resets the internal registers and the serial interface outputs in all channels to their default state (see Table 13). An active high pulse of longer than 40 ns duration will be required to activate the reset function in the device. Following a power-on reset or an external reset, the 554 is software compatible with previous generation of UARTs, 16C454 and 16C554. 2.3 Channel Selection The UART provides the user with the capability to bi-directionally transfer information between an external CPU and an external serial communication device. During Intel Bus Mode (16/68# pin is connected to VCC), a logic 0 on chip select pins, CSA#, CSB#, CSC# or CSD# allows the user to select UART channel A, B, C or D to configure, send transmit data and/or unload receive data to/from the UART. Selecting all four UARTs can be useful during power up initialization to write to the same internal registers, but do not attempt to read from all four uarts simultaneously. Individual channel select functions are shown in Table 1. During Motorola Bus Mode (16/68# pin is connected to GND), the package interface pins are configured for connection with Motorola, and other popular microprocessor bus types. In this mode the 554 decodes two additional addresses, A3 and A4, to select one of the four UART ports. The A3 and A4 address decode function is used only when in the Motorola Bus Mode. See Table 2. TABLE 1: CHANNEL A-D SELECT IN 16 MODE CSA# CSB# CSC# CSD# FUNCTION 1 1 1 1 UART de-selected 0 1 1 1 Channel A selected 1 0 1 1 Channel B selected 1 1 0 1 Channel C selected 1 1 1 0 Channel D selected 0 0 0 0 Channels A-D selected TABLE 2: CHANNEL A-D SELECT IN 68 MODE CS# A4 A3 FUNCTION 1 X X UART de-selected 0 0 0 Channel A selected 0 0 1 Channel B selected 0 1 0 Channel C selected 0 1 1 Channel D selected |
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