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ST16C650A_0508 Scheda tecnica(PDF) 11 Page - Exar Corporation |
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ST16C650A_0508 Scheda tecnica(HTML) 11 Page - Exar Corporation |
11 / 52 page xr ST16C650A REV. 5.0.1 2.90V TO 5.5V UART WITH 32-BYTE FIFO 11 2.6 Interrupt The output function of interrupt, INT, output changes according to the operating bus type and various factors. Table 3 summarizes its behavior in Intel and PC mode of operation. Multiple interrupts can be wire-OR’ed. This is accomplished by setting MCR bit-5 to a logic 1 and connecting a 1K Ω to 10KΩ resistor between this pin and ground to provide an acceptable logic 0 level. TABLE 3: INTERRUPT OUTPUT (INT AND IRQA) FUNCTIONS SEL INPUT S3 INPUT MCR BIT-5 (INT TYPE SELECT ) MCR BIT-3 (IRQN ENABLE ) INTERRUPT OUTPUT (INT OR IRQA) Intel Bus Mode 1 don’t care 0 don’t care INT is logic 0 for inactive interrupt. INT is logic 1 for active interrupt (active high) 1 don’t care 1 don’t care INT is three-state for inactive interrupt INT is logic 1 for active interrupt (open source). Requires a 1K- 10K Ω resistor to GND. PC Mode 0 0 don’t care don’t care IRQA is three-state. Either IRQB or IRQC is used, see Table 1. 0 1 don’t care 0 IRQA is three-state. 0 1 0 1 IRQA is logic 0 for inactive interrupt. IRQA is logic 1 for active interrupt (active high). 0 1 1 1 IRQA is three-state for no interrupt. IRQA is logic 1 for active interrupt (active high, open source). |
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