參數(shù)資料
型號(hào): ST16C650AIP40
廠商: EXAR CORP
元件分類: 微控制器/微處理器
英文描述: 2.90V TO 5.5V UART WITH 32-BYTE FIFO
中文描述: 1 CHANNEL(S), 3.125M bps, SERIAL COMM CONTROLLER, PDIP40
封裝: 0.600 INCH, PLASTIC, DIP-40
文件頁(yè)數(shù): 10/53頁(yè)
文件大?。?/td> 666K
代理商: ST16C650AIP40
ST16C650A
2.90V TO 5.5V UART WITH 32-BYTE FIFO
á
REV. 5.0.0
10
2.1.1
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.
PC MODE
T
ABLE
1: PC M
ODE
I
NTERFACE
O
N
-
CHIP
A
DDRESS
D
ECODER
AND
I
NTERRUPT
S
ELECTION
.
SEL
INPUT
S3, S2, S1
I
NPUTS
A9-A3 A
DDRESS
L
INES
TO
O
N
-
CHIP
D
ECODER
COM/LPT P
ORT
S
ELECTION
IRQ O
UTPUT
S
ELECTION
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
F
IGURE
6. PC M
ODE
I
NTERFACE
IN
AN
E
MBEDDED
A
PPLICATION
.
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
A3
A4
A5
A6
A7
A14
A15
AEN#
IOW#
INT
IOR#
RESET
D0
D1
D2
D3
D4
D5
D6
D7
IOW#
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
AEN*
RESET
VCC
IRQA
IRQB
IRQC
SEL
VCC
GND
IOR#
OP1#
RI#
CD#
DSR#
CTS#
RX
DTR#
TX
RTS#
S1
S2
S3
VCC
GND
GND
Embedded Application set to operate
at address 0x80F8 to 0x80FF
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