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ST16C650AIQ48 Fiches technique(PDF) 9 Page - Exar Corporation

No de pièce ST16C650AIQ48
Description  2.90V TO 5.5V UART WITH 32-BYTE FIFO
Download  52 Pages
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Fabricant  EXAR [Exar Corporation]
Site Internet  http://www.exar.com
Logo EXAR - Exar Corporation

ST16C650AIQ48 Fiches technique(HTML) 9 Page - Exar Corporation

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ST16C650A
REV. 5.0.1
2.90V TO 5.5V UART WITH 32-BYTE FIFO
9
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 5 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 5. 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
AE N #
IO W #
IO R #
RE S E T
D0
D1
D2
D3
D4
D5
D6
D7
IO W #
A0
A1
A2
R E SET
VC C
IN T
IR Q A
SE L
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#
CT S #
RX
TX
RT S #
DT R#
S1
S2
S3
VCC
GN D
GN D
E m bedded A pplication set to operate
at address 0x80F 8 to 0x80F F


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