參數(shù)資料
型號： NS16C2552
廠商： National Semiconductor Corporation
英文描述： Dual UART with 16-byte/64-byte FIFOs and up to 5 Mbit/s Data Rate
中文描述： 雙UART與16-byte/64-byte FIFO和高達5 Mbit / s的數(shù)據(jù)速率
文件頁數(shù)： 35/43頁
文件大?。?/td> 881K
代理商： NS16C2552
8.0 Design Notes
(Continued)
4.
The load capacitance of the crystal should match the
load capacitance of the oscillator circuitry seen by the
crystal. Under the AC conditions, the oscillator load ca-
pacitance is a lump sum of parasitic capacitance and
external capacitors. The capacitances connecting to os-
cillator input and output are in series seen by the crystal.
(
Figure 16
.) External capacitors, C1 and C2, are not
required to be very accurate. The best practice to follow
crystal manufacturer’s recommendation for the load ca-
pacitance value.
It should be noted that the parasitic capacitance also include
printed circuit board traces. The circuit board traces connect-
ing to the crystal should be kept as short as possible.
8.4 CONFIGURATION EXAMPLES
8.4.1 Set Baud Rate
Set divisor values to DIV_L and DIV_M.
LCR 0x03.7 = 1
DLL 0x00.7:0 = DIV_L
DLM 0x01.7:0 = DIV_M
LCR 0x03.7 = 0
8.4.2 Configure Prescaler Output
Set prescaler output to XIN divide by 4.
Save LCR 0x03.7:0 in temp
LCR 0x03.7:0 = 0xBF
EFR 0x02.4 = 1
LCR 0x03.7:0 = 0
MCR 0x04.7 = 1
LCR 0x03.7:0 = 0xBF
EFR 0x02.4 = 0 (optional)
LCR 0x03.7:0 = temp
Set prescaler output to XIN divide by 1.
Save LCR 0x03.7:0 in temp
LCR 0x03.7:0 = 0xBF
EFR 0x02.4 = 1
LCR 0x03.7:0 = 0
MCR 0x04.7 = 0
LCR 0x03.7:0 = 0xBF
EFR 0x02.4 = 0 (optional)
LCR 0x03.7:0 = temp
8.4.3 Set Xon and Xoff flow control
Set Xon1, Xoff1 to VAL1 and VAL2.
Save LCR 0x03.7:0 in temp
LCR 0x03.7:0 = 0xBF
Xon1 0x04.7:0 = VAL1
Xoff1 0x06.7:0 = VAL2
LCR 0x03.7:0 = temp
Set Xon2, Xoff2 to VAL1 and VAL2.
Save LCR 0x03.7:0 in temp
LCR 0x03.7:0 = 0xBF
Xon2 0x05.7:0 = VAL1
Xoff2 0x07.7:0 = VAL2
LCR 0x03.7:0 = temp
8.4.4 Set Software Flow Control
Set software flow control mode to VAL.
Save LCR 0x03.7:0 in temp
LCR 0x03.7:0 = 0xBF
EFR 0x02.3:0 = VAL
LCR 0x03.7:0 = temp
8.4.5 Configure Tx/Rx FIFO Threshold
Set Tx (2752) and Rx FIFO thresholds to VAL.
Save LCR 0x03.7:0 in temp
LCR 0x03.7:0 = 0xBF
EFR 0x02.4 = 1
LCR 0x03.7:0 = 0
FCR 0x02.7:0 = VAL
LCR 0x03.7:0 = 0xBF
EFR 0x02.4 = 0 (optional)
LCR 0x03.7:0 = temp
8.4.6 Tx and Rx Hardware Flow Control
Configure auto RTS and CTS flow controls, enable RTS and
CTS interrupts, and assert RTS.
Save LCR 0x03.7:0 in temp
LCR 0x03.7:0 = 0xBF
EFR 0x02.7:6 = 2b’11
EFR 0x02.4 = 1
LCR 0x03.7:0 = 0
IER 0x01.7:6 = 2b’11
MCR 0x04.1 = 1
LCR 0x03.7:0 = temp
8.4.7 Tx and Rx DMA Control
Configure Tx and Rx in FIFO mode DMA transfers using the
threshold in FCR[7:4].
Save LCR 0x03.7:0 in temp
LCR 0x03.7:0 = 0
FCR 0x02.0 = 1
20204818
FIGURE 16. Crystal Oscillator Circuit
N
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NS16C2552TVA 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual UART with 16-byte/64-byte FIFOs and up to 5 Mbit/s Data Rate
NS16C2552TVA/NOPB 功能描述:UART 接口集成電路 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
NS16C2552TVAX/NOPB 功能描述:UART 接口集成電路 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
NS16C2552TVS 制造商:Texas Instruments 功能描述:UART 2-CH 16Byte FIFO 3.3V/5V 48-Pin TQFP
NS16C2552TVS/NOPB 功能描述:UART 接口集成電路 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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