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ST16C650AIQ48 Fiches technique(PDF) 10 Page - Exar Corporation |
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ST16C650AIQ48 Fiches technique(HTML) 10 Page - Exar Corporation |
10 / 53 page ST16C650A áç áç áç áç 2.90V TO 5.5V UART WITH 32-BYTE FIFO REV. 5.0.0 10 2.1.1 PC MODE The PC mode interface includes an on-chip address decoder and interrupt selection function for the standard PC COM 1-4 port addresses. The selection is made through three input signals: S1, S2 and S3. The selection summary is shown in Table 1. Although the on-chip address decoder was designed for PC applications ranging from 0x278 to 0x3FF, it can fit into an embedded applications by offsetting the address lines to the 650A. An example is shown in Figure 6 where the UART is operating from 0x80F8 to 0x80FF address space. Operating in the PC mode eliminates external address decode components. TABLE 1: PC MODE INTERFACE ON-CHIP ADDRESS DECODER AND INTERRUPT SELECTION. SEL INPUT S3, S2, S1 INPUTS A9-A3 ADDRESS LINES TO ON-CHIP DECODER COM/LPT PORT SELECTION IRQ OUTPUT SELECTION 0 0 0 0 0x3F8 - 0x3FF COM-1 IRQB (for PC’s IRQ4) 0 0 0 1 0x2F8 - 0x2FF COM-2 IRQC (for PC’s IRQ3) 0 0 1 0 0x3E8 - 0x3EF COM-3 IRQB (for PC’s IRQ4) 0 0 0 0 0x3F8 - 0x3FF COM-4 IRQB (for PC’s IRQ4) 0 1 0 0 0x2F8 - 0x2FF COM-1 IRQA (for PC’s IRQn 0 1 0 1 0x3E8 - 0x3EF COM-2 IRQA (for PC’s IRQn) 0 1 1 0 0x2E8 - 0x2EF COM-3 IRQA (for PC’s IRQn) 0 1 1 1 0x3F8 - 0x3FF COM-4 IRQA (for PC’s IRQn) 0 - - - 0x278 - 0x27F LPT-2 N/A 0 - - - 0x378 - 0x37F LPT-1 N/A FIGURE 6. PC MODE INTERFACE IN AN EMBEDDED APPLICATION. D0 D1 D2 D3 D4 D5 D6 D7 A0 A1 A2 A3 A4 A5 A6 A7 A14 A15 AEN # IO W # IO R # R ESET D0 D1 D2 D3 D4 D5 D6 D7 IO W # A0 A1 A2 R ESET VC C IN T IR Q A SEL VC C GN D IO R # IR Q B IR Q C A3 A4 A5 A6 A7 A8 A9 AEN * OP 1 # RI# CD# DS R# CTS # RX TX RTS # DTR # S1 S2 S3 VC C GN D GN D E m bedded A pplication se t to operate at address 0x 80 F 8 to 0x80F F |
Numéro de pièce similaire - ST16C650AIQ48 |
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Description similaire - ST16C650AIQ48 |
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