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ST16C454CJ68 Folha de dados(PDF) 4 Page - Exar Corporation |
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ST16C454CJ68 Folha de dados(HTML) 4 Page - Exar Corporation |
4 / 30 page ST16C454/68C454 4 Rev. 3.20 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 ST16C454 is selected. When this pin is a logic 0, the 68 mode interface (ST68C454) 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. A0 34 I Address-0 Select Bit. Internal registers address selection in 16 and 68 modes. A1 33 I Address-1 Select Bit. Internal registers address selection in 16 and 68 modes. A2 32 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. -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, this pin functions as -CSA, see definition under -CS A-B. -CS A-B 16,20 -CS C-D 50,54 I Chip Select A, B, C, D (active low) - This function is associated with the 16 mode only, and for individual channels, A through D. When in 16 Mode, these pins enable data transfers between the user CPU and the ST16C454 for the channel(s) addressed. Individual UART sections (A, B, C, D) are addressed by providing a logic 0 on the respective -CS A-D pin. When the 68 mode is selected, the functions of these pins are reassigned. 68 mode functions are described under the their respective name/pin headings. Symbol Pin Signal Pin Description type SYMBOL DESCRIPTION |
Nº de peça semelhante - ST16C454CJ68 |
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Descrição semelhante - ST16C454CJ68 |
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