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ST16654 Fiches technique(PDF) 5 Page - Exar Corporation |
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ST16654 Fiches technique(HTML) 5 Page - Exar Corporation |
5 / 49 page ST16C654/654D 5-69 Rev. 4.10 SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 68 100 64 type 16/-68 31 36 - 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 16C554 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 inter- nally 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 39 24 I Address-0 Select Bit. Internal registers address selection in 16 and 68 modes. A1 33 38 23 I Address-1 Select Bit. Internal registers address selection in 16 and 68 modes. A2 32 37 22 I Address-2 Select Bit. - Internal registers address selection in 16 and 68 modes. A3-A4 20,50 17,64 - I Address 3-4 Select Bits. - When the 68 mode is selected, these pins are used to address or select individual UART’s (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. CLKSEL 30 35 - I Clock Select. - The 1X or 4X pre-scaleable clock is selected by this pin. The 1X clock is selected when CLKSEL is a logic 1 (connected to VCC) or the 4X is selected when CLKSEL is a logic 0 (connected to GND). MCR bit-7 can override the state of this pin following reset or initialization (see MCR bit- 7). This pin is not available on 64 pin packages which provide MCR bit-7 selection only. -CS 16 13 - I Chip Select. (active low) - In the 68 mode, this pin functions as a multiple channel chip enable. In this case, all four |
Numéro de pièce similaire - ST16654 |
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Description similaire - ST16654 |
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