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XR16C850CQ Datasheet(PDF) 5 Page - Exar Corporation |
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XR16C850CQ Datasheet(HTML) 5 Page - Exar Corporation |
5 / 55 page XR16C850 5 Rev. 1.20 A0 28 31 28 31 I Address-0 Select Bit - Internal registers address selection in PC and STD modes. A1 27 30 27 30 I Address-1 Select Bit Internal registers address selection in PC and STD modes A2 26 29 26 29 I Address-2 Select Bit Internal registers address selection in PC and STD modes A3 / IOR 22 25 20 22 I Address-3 Select Bit or Input/Output Read (dual function) - When the PC mode is selected, this pin is used as 4th address line to decode the COM1-4 and LPT ports. During STD mode operation this pin is used as Read strobe. Its function is the same as -IOR (see -IOR), except it is active high. Either an active -IOR or IOR is required to transfer data from 850 to CPU during a read operation. Connect this pin to GND when –IOR is used. A4 - 12 6 6 I Address-4 Select Bit (internal pull-up) - When the PC mode is selected, this pin is used as 5th address line to decode the COM1-4 and LPT ports. This pin has no function in the STD mode. A5 / CS0 12 14 9 9 I Address-5 Select Bit or Chip Select-0 (dual function) - When the PC mode is selected, this pin is used as 6th address line to decode the COM1-4 and LPT ports. During STD mode a logical 1 on this pin provides the chip select 0 function. Connect this pin to VCC when CS1 or –CS2 is used. A6 / CS1 13 15 10 10 I Address-6 Select Bit or Chip Select-1 (dual function) - When the PC mode is selected, this pin is used as 7th address line to decode the COM1-4 and LPT ports. During STD mode a logical 1 on this pin provides the chip select 1 function. Connect this pin to VCC when CS0 or –CS2 is used. A7 / -CS2 14 16 11 7 I Address-7 Select Bit or Chip Select -2 (dual func- tion) - When the PC mode is selected, this pin is used as 8th address line to decode the COM1-4 and LPT ports. During STD mode a logical 1 on this pin provides the chip select 2 function. Connect this pin Symbol Pin Signal Pin Description 40 44 48 52 type SYMBOL DESCRIPTION |
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Similar Description - XR16C850CQ |
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