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MC14469P bảng dữ liệu(PDF) 5 Page - LANSDALE Semiconductor Inc.

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Giải thích chi tiết về linh kiện  Addressable Asynchronous Receiver/Transmitter
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Issue 0
LANSDALE Semiconductor, Inc.
ML14469
PIN DESCRIPTIONS
A0 – A6
Address Inputs
These inputs are the address setting pins which contain the
address match for the received signal. Pins A0 – A6 have
on–chip pull–up resistors.
C0 – C6
Command Word
These pins are the readout of the general–purpose command
word which is the second word of the received signal.
CS
Command Strobe
This is the output for the command strobe signifying a valid
set of command data (C0 – C6). The pulse width is one oscil-
lator cycle. For example, when a 307.2 kHz ceramic resonator
is used, the pulse width is approximately 3 µs.
ID0 – ID7
Input Data Pins
These pins contain the input data for the first eight bits of
data to be transmitted. Pins ID0 – ID7 have on–chip pull–up
resistors.
OSC1, OSC2
Oscillator Input and Oscillator Output
These pins are the oscillator input and output (see Figure3).
RESET
Reset
When this pin is pulled low for a minimum of 700 ns, the
circuit is reset and ready for operation.
RI
Receive Input
This is the receive input pin.
S0 – S7
Second or Status Input Data
These pins contain the input data for the second eight bits of
data to be transmitted.
SEND
Send
This pin accepts the send command after receipt of an
address.
TRO
Transmit Register Output Signal
This pin transmits the outgoing signal. Note that it is invert-
ed from the incoming signal. It must go through one stage of
inversion if it is to drive another ML14469.
VAP
Valid Address Pulse
This is the output for the valid address pulse upon receipt of
a matched incoming address.
VDD
Positive Power Supply
This pin is the package positive power supply connection.
This pin may range from + 4.5 V to + 18 V with respect
toVSS.
VSS
Negative Power Supply
This pin is the negative power supply connection. Normally
this pin is system ground.
OPERATING CHARACTERISTICS
The receipt of a start bit on the receive input (RI) line causes
the receive clock to start at a frequency equal to that of the
oscillator divided by 64. All received data is strobed in at the
center of a receive clock period. The start bit is followed by
eight data bits. Seven of the bits are compared against states of
the address of the particular circuit (A0 –A6). Address is
latched 31 clock cycles after the end of the start bit of the
incoming address. The eighth bit signifies an address word “1”
or a command word “0”. Next, a parity bit is received and
checked by the internal logic for even parity. Finally a stop bit
is received. At the completion of the cycle if the address
matches, a valid address pulse (VAP) occurs. Immediately fol-
lowing the address word, a command word is received. It also
contains a start bit, eight data bits, even parity bit, and a stop
bit. The eight data bits are composed of a seven–bit command,
and a “0” which indicates a command word. At the end of the
command word a command strobe pulse (CS) occurs.
A positive transition on the send input initiates the transmit
sequence. Send must occur within seven bit times of CS. Again
the transmitted data is made up of two eleven–bit words, i.e.,
address and command words. The data portion of the first
word is made up from input data inputs (ID0 –ID7), and the
data for the second word from second input data (S0 – S7)
inputs. The data on inputs ID0 – ID7 is latched one clock
before the falling edge of the start bit. The data on inputs S0 –
S7 is latched on the rising edge of the start bit. The transmitted
signal is the inversion of the received signal, which allows the
use of an inverting amplifier to drive the lines. TRO begins
either 1/2 or 1–1/2 bit times after send, depending where send
occurs.
The oscillator can be crystal controlled or ceramic resonator
controlled for required accuracy. OSC1 can be driven from an
external oscillator (see Figure 3).


Số phần tương tự - MC14469P

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