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ST16C650A Scheda tecnica(PDF) 11 Page - Exar Corporation

Il numero della parte ST16C650A
Spiegazioni elettronici  2.90V TO 5.5V UART WITH 32-BYTE FIFO
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Produttore elettronici  EXAR [Exar Corporation]
Homepage  http://www.exar.com
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ST16C650A Scheda tecnica(HTML) 11 Page - Exar Corporation

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ST16C650A
11
REV. 5.0.2
2.90V TO 5.5V UART WITH 32-BYTE FIFO
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
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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