- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383098 > ID82C50A (HARRIS SEMICONDUCTOR) CMOS Asynchronous Communications Element PDF資料下載
參數(shù)資料
| 型號： | ID82C50A |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | CMOS Asynchronous Communications Element |
| 中文描述： | 1 CHANNEL(S), 625K bps, SERIAL COMM CONTROLLER, CDIP40 |
| 文件頁數(shù)： | 6/21頁 |
| 文件大?。?/td> | 101K |
| 代理商： | ID82C50A |
6
Accessible Registers
The three types of internal registers in the 82C50A used in
the operation of the device are control, status, and data
registers. The control registers are the Bit Rate Select
Register DLL and DLM, Line Control Register, Interrupt
Enable Register and the Modem Control registers, while the
status registers are the Line Status Registers and the
Modem Status Register. The data registers are the Receiver
Buffer Register and Transmitter Holding Register. The
Address, Read, and Write inputs are used in conjunction
with the Divisor Latch Access Bit in the Line Control Register
(LCR(7)) to select the register to be written or read (see
Table 1.). Individual bits within these registers are referred to
by the register mnemonic and the bit number in parenthesis.
An example, LCR(7) refers to Line Control Register Bit 7.
The Transmitter Buffer Register and Receiver Buffer Regis-
ter are data registers holding from 5-8 data bits. If less than
eight data bits are transmitted, data is right justified to the
LSB. Bit 0 of a data word is always the first serial data bit
received and transmitted. The 82C50A data registers are
double buffered so that read and write operations can be
performed at the same time the UART is performing the par-
allel to serial and serial to parallel conversion. This provides
the microprocessor with increased flexibility in its read and
write timing.
TABLE 1. ACCESSING 82C50A INTERNAL REGISTERS
DLAB
A2
A1
A0
MNEMONIC
REGISTER
0
0
0
0
RBR
Receiver Buffer
Register (read only)
0
0
0
0
THR
Transmitter Holding
Register (write only)
0
0
0
1
lER
Interrupt Enable
Register
X
0
1
0
IIR
Interrupt Identifica-
tion Register
(read only)
X
0
1
1
LCR
Line Control Register
X
1
0
0
MCR
Modem Control
Register
X
1
0
1
LSR
Line Status Register
X
1
1
0
MSR
Modem Status
Register
X
1
1
1
SCR
Scratch Register
1
0
0
0
DLL
Divisor Latch (LSB)
1
0
0
1
DLM
Divisor Latch (MSB)
NOTE: X = “Don’t Care”, 0 = Logic Low, 1 = Logic High
Line Control Register (LCR)
LCR
7
LCR
6
LCR
5
LCR
4
LCR
3
LCR
2
LCR
1
LCR
0
Word
Length
Select
0 0 = 5 Data Bits
0 1 = 6 Data Bits
1 0 = 7 Data Bits
1 1 = 8 Data Bits
Stop
Bit
Select
0 = 1 Stop Bit
1 = 1.5 Stop Bits if 5 Data Bit Word Length is Selected 2 Stop Bits if
6, 7, or 8 Data Bit Word Length is Selected
Parity
Enable
0 = Parity Disabled
1 = Parity Enabled (Generated & Checked)
Even Parity
Select
0 = Odd Parity When Parity is Enabled
1 = Even Parity When Parity is Enabled
Stick Parity
0 = Stick Parity Disabled
1 = When Parity is Enabled Forces the Transmission and Checking
of a Parity Bit of a Known State. Parity Bit Forced to a Logic 1 if
LCR (4) = 0 or to a Logic 0 If LCR (4) = 1.
Break
Control
0 = Break Disabled
1 = Break Enabled. The Serial Output (SOUT) is Forced to the
Spacing (Logic 0) State.
Divisor
Latch
Access Bit
0 = Must be Low to Access the Receiver Buffer. Transmitter Holding
Register or the Interrupt Enable Register.
1 = Must be High to Access the Divisor Latches DLL and DLM of the
Baud Rate Generator During a Read or Write Operation.
82C50A
相關PDF資料 |
PDF描述 |
|---|---|
| ID82C52 | CMOS Serial Controller Interface |
| ID82C54 | CMOS Programmable Interval Timer |
| ID82C54-10 | CMOS Programmable Interval Timer |
| ID82C54-12 | CMOS Programmable Interval Timer |
| ID82C59A | CMOS Priority Interrupt Controller |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ID82C50A-5 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS Asynchronous Communications Element |
| ID82C52 | 功能描述:UART 接口集成電路 PERIPH UART/BRG 5V 16MHZ 28CDIP IND 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 |
| ID82C52/+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UART |
| ID82C54 | 功能描述:計時器和支持產(chǎn)品 PERIPH PRG-CNTR 5V 8MHZ 24CDIP IND RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| ID82C54/+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Timer Circuit |
發(fā)布緊急采購，3分鐘左右您將得到回復。