參數(shù)資料
型號(hào)： 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(yè)數(shù)： 15/21頁(yè)
文件大?。?/td> 101K
代理商： ID82C50A
15
Programming
The 82C50A is programmed by the control registers LCR,
lER, DLL and DLM, and MCR. These control words define
the character length, number of stop bits, parity, baud rate,
and modem interface.
While the control registers can be written in any order, the
lER should be written to last because it controls the interrupt
enables. Once the 82C50A is programmed and operational,
these registers can be updated any time the 82C50A is not
transmitting or receiving data.
The control signals required to access 82C50A internal reg-
isters are shown below.
Software Reset
A software reset of the 82C50A is a useful method for return-
ing to a completely known state without a system reset.
Such a reset consists of writing to the LCR, Divisor Latches,
and MCR registers. The LSR and RBR registers should be
read prior to enabling interrupts in order to clear out any
residual data or status bits which may be invalid for subse-
quent operation.
Crystal Operation
The 82C50A crystal oscillator circuitry is designed to oper-
ate with a fundamental mode, parallel resonant crystal. Table
8 shows the required crystal parameters and crystal circuit
configuration, respectively.
When using an external clock source, the XTAL1 input is
driven and the XTAL2 output is left open. Power
consumption when using an external clock is typically 50%
of that required when using a crystal. This is due to the
sinusoidal nature of the drive circuitry when using a crystal.
The maximum frequency of the 82C50A is 10MHz with an
external clock or a crystal attached to XTAL1 and XTAL2.
Using the external clock or crystal, and a divide by one
divisor, the maximum BAUDOUT is 10MHz, and the
maximum data rate is 625Kbps.
Out2
Master Reset
High
RTS
Master Reset
High
DTR
Master Reset
High
Out1
Master Reset
High
TABLE 7. 82C50A RESET OPERATIONS (Continued)
REGISTER/SIGNAL
RESET CONTROL
RESET
TABLE 8. TYPICAL CRYSTAL OSCILLATOR CIRCUIT
PARAMETER
Frequency
1.0 to 10MHz
Type of Operation
Parallel Resonant, Fundamental
Mode
Load Capacitance (CL)
20 or 32pF (Typ)
R
SERIES
(Max)
100
(f = 10MHz, CL = 32pF)
200
(f = 10MHz, CL = 20pF)
FIGURE 2. TYPICAL CRYSTAL OSCILLATOR CIRCUIT
CL
XTAL
XTAL1
XTAL2
TO
BAUD RATE
GENERATOR
LOGIC
PIN 17
PIN 16
RS
CL
82C50A
82C50A
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