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XR16C864IQ-F Datasheet(PDF) 10 Page - Exar Corporation |
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XR16C864IQ-F Datasheet(HTML) 10 Page - Exar Corporation |
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10 / 51 page  XR16C864 10 2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO REV. 2.2.0 2.2 5-Volt Tolerant Inputs For devices that have top mark date code "F2 YYWW" and newer, the 864 can accept a voltage of up to 5.5V on any of its inputs (except XTAL1) when operating from 2.97V to 5.5V. XTAL1 is not 5 volt tolerant. Devices that have top mark date code "DC YYWW" and older do not have 5V tolerant inputs. 2.3 Device Reset The RESET input resets the internal registers and the serial interface outputs in all four channels to their default state (see Table 19). 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 864 is software compatible with previous generation of UARTs, 16C454 and 16C554 and 16C654. 2.4 Device Identification and Revision The XR16C864 provides a Device Identification code and a Device Revision code to distinguish the part from other devices and revisions. To read the identification code from the part, it is required to set the baud rate generator registers DLL and DLM both to 0x00. Now reading the content of the DLM will provide 0x14 for the XR16C864 and reading the content of DLL will provide the revision of the part; for example, a reading of 0x01 means revision A. 2.5 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 864 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 N/A N/A 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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Similar Description - XR16C864IQ-F |
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