参数资料
型号: ST16C650AIJ44-F
厂商: Exar Corporation
文件页数: 50/50页
文件大小: 0K
描述: IC UART FIFO 32B 44PLCC
标准包装: 27
特点: *
通道数: 1,UART
FIFO's: 32 字节
规程: 打印机,RS232,RS422,RS485
电源电压: 2.9 V ~ 5.5 V
带并行端口:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 44-LCC(J 形引线)
供应商设备封装: 44-PLCC(16.59x16.59)
包装: 管件
ST16C650A
9
REV. 5.0.3
2.90V TO 5.5V UART WITH 32-BYTE FIFO
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
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 1 1
0x2E8 - 0x2EF
COM-4
IRQC (for PC’s IRQ3)
0
1 0 0
0x3F8 - 0x3FF
COM-1
IRQA (for PC’s IRQn)
0
1 0 1
0x2F8 - 0x2FF
COM-2
IRQA (for PC’s IRQn)
0
1 1 0
0x3E8 - 0x3EF
COM-3
IRQA (for PC’s IRQn)
0
1 1 1
0x2E8 - 0x2EF
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
E m bedded A pplication set to operate
at address 0x80F 8 to 0x80F F
S3, S2, S1
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