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ST16C554DCQ64 Scheda tecnica(PDF) 5 Page - Exar Corporation |
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ST16C554DCQ64 Scheda tecnica(HTML) 5 Page - Exar Corporation |
5 / 40 page ST16C554/554D/68C554 5 Rev. 3.10 SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 68 64 type 16/-68 31 - I 16/68 Interface Type Select (input with internal pull-up). - This input provides the 16 (Intel) or 68 (Motorola) bus interface type select. The functions of -IOR, -IOW, INT A- D, and -CS A-D are re-assigned with the logical state of this pin. When this pin is a logic 1, the 16 mode interface 16C554D is selected. When this pin is a logic 0, the 68 mode interface (68C554) is selected. When this pin is a logic 0, - IOW is re-assigned to -R/W, RESET is re-assigned to - RESET, -IOR is not used, and INT A-D(s) are connected in a WIRE-OR configuration. The WIRE-OR outputs are connected internally to the open source IRQ signal output. This pin is not available on 64 pin packages which operate in the 16 mode only. A0 34 24 I Address-0 Select Bit. Internal registers address selection in 16 and 68 modes. A1 33 23 I Address-1 Select Bit. Internal registers address selection in 16 and 68 modes. A2 32 22 I Address-2 Select Bit. - Internal registers address selection in 16 and 68 modes. A3-A4 20,50 - I Address 3-4 Select Bits. - When the 68 mode is selected, these pins are used to address or select individual UARTs (providing -CS is a logic 0). In the 16 mode, these pins are reassigned as chip selects, see -CSB and -CSC. These pins are not available on 64 pin packages which operate in the 16 mode only. -CS 16 - I Chip Select. (active low) - In the 68 mode, this pin functions as a multiple channel chip enable. In this case, all four UARTs (A-D) are enabled when the -CS pin is a logic 0. An individual UART channel is selected by the data contents of address bits A3-A4. When the 16 mode is selected (68 pin device), this pin functions as -CSA, see definition under -CS A-B. This pin is not available on 64 pin packages which operate in the 16 mode only. |
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