參數(shù)資料
型號(hào)： NS16C2752
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(dá)5 Mbit / s的數(shù)據(jù)速率
文件頁(yè)數(shù)： 27/43頁(yè)
文件大?。?/td> 881K
代理商： NS16C2752
7.0 Operation and Configuration
7.1 CLOCK INPUT
The NS16C2552/2752 has an on-chip oscillator that accepts
standard crystal with parallel resonant and fundamental fre-
quency. The generated clock is supplied to both UART chan-
nels with the capability range from DC to 24 MHz. The
frequency of the clock oscillator is divided by 16 internally,
combined with an on-chip programmable clock divider pro-
viding the baud rate for data transmission. The divisor is
16-bit with MSB byte in DLM and LSB byte in DLL. The
divisor calculation is shown in
Section 6.11 PROGRAM-
MABLE BAUD GENERATOR
.
The external oscillator circuitry requires two load capacitors,
a parallel resistor, and an optional damping resistor. The
oscillator circuitry is shown in
Figure 2
.
The requirement of the crystal is listed in
Table 25
.
TABLE 25. Crystal Component Requirement
Parameter
Value
<
= 24 MHz
Parallel resonant
Fundamental
10 - 22 pF
20 - 120
100 ppm
Crystal Frequency Range
Crystal Type
C1 & C2, Load Capacitance
ESR
Frequency Stability 0 to 70C
The capacitors C1 and C2 are used to adjust the load
capacitance on these pins. The total load capacitance (C1,
C2 and crystal) must be within a certain range for the
NS16C2552/2752 to function properly. The parallel resistor
Rp and load resistor Rs are recommended by some crystal
vendors. Refer to the vendor’s crystal datasheet for details.
Since each channel has a separate programmable clock
divider, each channel can have a different baud rate.
The oscillator provides clock to the internal data transmis-
sion circuitry, writing and reading from the parallel bus is not
affected by the oscillator frequency. For circuits not using the
external crystal, the clock input is XIN (
Figure 3
.)
7.2 RESET
The NS16C2552/2752 has an on-chip power-on reset. An
external active high reset can also be applied. The default
output state of the device is listed in
Table 26
.
TABLE 26. Output State After Reset
Output
Reset State
Logic 1
Logic 1
Logic 1
Logic 1
Logic 0
Logic 0
SOUT1, SOUT2
OUT2
RTS1, RTS2
DTR1, DTR2
INTR1, INTR2
TXRDY1, TXRDY2
7.3 RECEIVER OPERATION
Each serial channel consists of an 8-bit Receive Shift Reg-
ister (RSR) and a 16 (or 64) -byte by 11-bit wide Receive
FIFO. The RSR contains a 8-bit Receive Buffer Register
(RBR) that is part of the Receive FIFO. The 11-bit wide FIFO
contains an 8-bit data field and a 3-bit error flag field. The
RSR uses 16X clock as timing source. (
Figure 4
.)
20204804
FIGURE 2. Crystal Oscillator Circuitry
20204805
FIGURE 3. Clock Input Circuitry
N
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參數(shù)描述
NS16C2752TVA 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
NS16C2752TVA/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
NS16C2752TVAX/NOPB 功能描述:UART 接口集成電路 Dual UART w/ 64-byte FIFO 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
NS16C2752TVS 制造商:Texas Instruments 功能描述:UART 2-CH 64Byte FIFO 3.3V/5V 48-Pin TQFP
NS16C2752TVS/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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