參數(shù)資料
型號(hào)： NS16C2752TVA
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 微控制器/微處理器
英文描述： Dual UART with 16-byte/64-byte FIFOs and up to 5 Mbit/s Data Rate
中文描述： 2 CHANNEL(S), 5M bps, SERIAL COMM CONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 23/43頁(yè)
文件大?。?/td> 881K
代理商： NS16C2752TVA
6.0 Register Set
(Continued)
6.10 SCRATCHPAD REGISTER (SCR)
This 8-bit Read/Write Register does not control the serial
channel in any way. It is intended as a Scratchpad Register
to be used by the programmer to hold data temporarily.
TABLE 14. SCR (0x7)
Bit
Bit Name
R/W
Def
Description
7:0
SCR Data
R/W
0xFF
Scratchpad Register
This 8-bit register does not control the UART in any way. It is intended as a
scratchpad register to be used by the programmer to hold temporary data.
6.11 PROGRAMMABLE BAUD GENERATOR
The NS16C2552 contains two independently programmable
Baud Generators. Each is capable of taking prescaler input
and dividing it by any divisor from 1 to 2
16
-1 (
Figure 1
). The
highest input clock frequency recommended with a divisor =
1 is 80MHz. The output frequency of the Baud Generator is
16 X the baud rate, [divisor # = (frequency input) / (baud rate
X 16)]. The output of each Baud Generator drives the trans-
mitter and receiver sections of the associated serial channel.
Two 8-bit latches per channel store the divisor in a 16-bit
binary format. These Divisor Latches must be loaded during
initialization to ensure proper operation of the Baud Genera-
tor. Upon loading either of the Divisor Latches, a 16-bit Baud
Counter is loaded.
TABLE 15. DLL (0x0, LCR[7] = 1, LCR != 0xBF)
Bit
Bit Name
R/W
Def
Description
7:0
DLL Data
R/W
0xXX
Divisor Latch LSB
This 8-bit register holds the least significant byte of the 16-bit baud rate generator divisor.
Note:
This register value does not change upon MR reset.
TABLE 16. DLM (0x1, LCR[7] = 1, LCR != 0xBF)
Bit
Bit Name
R/W
Def
Description
7:0
DLM Data
R/W
0xXX
Divisor Latch MSB
This 8-bit register holds the most significant byte of the 16-bit baud rate generator divisor.
Note:
This register value does not change upon MR reset.
Table 17
provides decimal divisors to use with crystal fre-
quencies of 1.8432 MHz, 3.072 MHz and 18.432 MHz. For
baud rates of 38400 and below, the error obtained is mini-
mal. The accuracy of the desired baud rate is dependent on
the crystal frequency chosen. Using a divisor of zero is
not
recommended.
TABLE 17. Baud Rate Generation Using 1.8432 MHz Clock with MCR[7]=0
Output Data
Baud Rate
50
75
150
300
600
1200
2400
4800
9600
19,200
38,400
115,200
Output 16x Clock
Divider (dec)
2304
1536
768
384
192
96
48
24
12
6
3
1
User 16x Clock
Divisor (hex)
900
600
300
180
C0
60
30
18
0C
06
03
01
DLM Program
Value (hex)
09
06
03
01
00
00
00
00
00
00
00
00
DLL Program
Value (hex)
00
00
00
80
C0
60
30
18
0C
06
03
01
Data Rate
Error (%)
0
0
0
0
0
0
0
0
0
0
0
0
Note:
For baud rates of 250k, 300k, 375k, 500k, 750k and 1.5M using a
24MHz crystal causes minimal error.
N
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參數(shù)描述
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
NS16C2752TVSX/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
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