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參數(shù)資料
| 型號(hào)： | IS82C52 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | CMOS Serial Controller Interface |
| 中文描述： | 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 255K |
| 代理商： | IS82C52 |
5-5
Baud Rate Select Register (BRSR)
The 82C52 is designed to operate with a single crystal or
external clock driving the IX input pin. The Baud Rate Select
Register is used to select the divide ratio (one of 72) for the
internal Baud Rate Generator circuitry. The internal circuitry
is separated into two separate counters, a Prescaler and a
Divisor Select. The Prescaler can be set to any one of four
division rates,
÷
1,
÷
3,
÷
4, or
÷
5.
The Prescaler design has been optimized to provide
standard baud rates using any one of three popular crystal
frequencies. By using one of these common system clock
frequencies, 1.8432MHz, 2.4576MHz or 3.072MHz and
Prescaler divide ratios of
÷
3,
÷
4, or
÷
5 respectively, the
Prescaler output will provide a constant 614.4KHz. When
this frequency is further divided by the Divisor Select
counter, any of the standard baud rates from 50 Baud to
38.4Kbaud can be selected (see Table 2). Non-standard
baud rates up to 1Mbaud can be selected by using different
input frequencies (crystal or an external frequency input up
to 16MHz) and/or different Prescaler and Divisor Select
ratios.
Regardless of the baud rate, the baud rate generator
provides a clock which is 16 times the desired baud rate. For
example, in order to operate at a 1Mbaud data rate, a
16MHz crystal, a Prescale rate of
÷
1, and a Divisor Select
rate of “external” would be used. This would provide a
16MHz clock as the output of the Baud Rate Generator to
the Transmitter and Receiver circuits.
The CO select bit in the BRSR selects whether a buffered
version of the external frequency input (IX input) or the Baud
Rate Generator output (16x baud rate clock) will be output
on the CO output (pin 21). The Baud Rate Generator output
will always be a 50% nominal duty cycle except when “exter-
nal” is selected and the Prescaler is set to
÷
3 or
÷
5.
NOTE: These baud rates are based upon the following input
frequency/ Prescale divisor combinations.
1.8432MHz and Prescale =
÷
3
2.4576MHz and Prescale =
÷
4
3.072MHZ and Prescale =
÷
5
All baud rates are exact except for:
Modem Control Register
The MCR is a general purpose control register which can be
written to and read from. The RTS and DTR outputs are
directly controlled by their associated bits in this register.
Note that a logic one asserts a true logic level (low) at these
output pins. The Interrupt Enable (INTEN) bit is the overall
control for the INTR output pin. When INTEN is false, INTR
is held false (low).
The Operating Mode bits configure the 82C52 into one of
four possible modes. “Normal” configures the 82C52 for nor-
mal full or half duplex communications. “Transmit Break”'
enables the transmitter to only transmit break characters
(Start, Data and Stop bits all are logic zero). The Echo Mode
causes any data that is received on the SDI input pin to be
retransmitted on the SDO output pin. Note that this output is
a buffered version of the data seen on the SDI input and is
not a resynchronized output. Also note that normal UART
transmission via the Transmitter Register is disabled when
operating in the Echo mode (see Figure 4). The Loop Test
Mode internally routes transmitted data to the receiver
circuitry for the purpose of self test. The transmit data is
D7 D6 D5 D4 D3 D2 D1 D0
Prescaler
Select
00 =
÷
1
01 =
÷
3
10 =
÷
4
11 =
÷
5
00000 =
÷
2
00001 =
÷
4
00010 =
÷
16/3
00011 =
÷
8
00100 =
÷
32/3
00101 =
÷
16
00110 =
÷
58/3
00111 =
÷
22
01000 =
÷
32
01001 =
÷
64
01010 =
÷
128
01011 =
÷
192
01100 =
÷
256
01101 =
÷
288
01110 =
÷
352
01111 =
÷
512
10000 =
÷
768
11111 = External (
÷
1)
Divisor
Select
CO
Select
0 = IX Output
1 = Brg Output (On
Reset, D7 (CO Select)
is Reset to 0)
FIGURE 2. BRSR
TABLE 2.
BAUD RATE
DIVISOR
38.4K
External
19.2K
2
9600
4
7200
16/3
4800
8
3600
32/3
2400
16
2000
58/3
1800
22
1200
32
600
64
300
128
200
192
150
256
134.5
288
110
352
75
512
50
768
BAUD RATE
ACTUAL
PERCENT ERROR
1800
1745.45
3.03%
2000
1986.2
0.69%
134.5
133.33
0.87%
110
109.09
0.83%
82C52
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IS82C52/TR100/BAE | 制造商:Intersil Corporation 功能描述:PERIPH UART/BRG 5V 16MHZ 28PLCC IND - Tape and Reel |
| IS82C5296 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| IS82C52R2490 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| IS82C52Z | 功能描述:UART 接口集成電路 W/ANNEAL PERIPH /BRG 5V 16MHZ 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 |
| IS82C52Z96 | 功能描述:UART 接口集成電路 W/ANNEAL PERIPH /BRG 5V 16MHZ 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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