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E-LAB Digital Engineering
E-LAB Digital Engineering

EDE300 Datasheet Preview

EDE300 Datasheet

Parallel / Serial Transceiver IC

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EDE300 Parallel/ Serial Transceiver IC
Data Direction, Output Latch 1
0=2400,1=9600 2
0=Local, 1=Host 3
Connect to +5V DC 4
Digital Ground 5
Data I/O Pin 0 6
Data I/O Pin 1 7
Data I/O Pin 2 8
Data I/O Pin 3 9
EDE300
Dir/Latch XMIT
BAUD
RCV
Mode
OSC1
+5V
OSC2
GND
+5V
D0 D7
D1 D6
D2 D5
D3 D4
18 Serial Transmit
17 Serial Receive
16 Oscillator Connection
15 Oscillator Connection
14 Connect to +5V DC
13 Data I/O Pin 7
12 Data I/O Pin 6
11 Data I/O Pin 5
10 Data I/O Pin 4
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The EDE300 Parallel/ Serial Transceiver IC is a 5 volt, 18 pin package designed to
conveniently convert 8-bit parallel data into serial format and vice-versa. The EDE300 is ideal for
logging data to a PC, controlling hardware via the PC serial port, communicating 8-bit data via a
serial connection, and expanding I/O capabilities on microcontrollers and Stamps. The EDE300 is
BAUD-selectable, offering both 2400 and 9600 BAUD communication. PC connection requires the
use of a voltage level shifter such as the MAX233. The EDE300 can be configured as either a half-
duplex transmitter, a half-duplex receiver, or a half-duplex bi-directional transceiver.
PIN DEFINITIONS
Flow Control Pins:
Data Direction, /Latch (PIN 1):
Baud Rate (PIN 2):
Mode (PIN 3):
Data Pins:
Serial Transmit (PIN 18) :
Serial Receive (PIN 17):
D0..D7 (PIN 6..PIN 13):
In Local Control Mode pin is an INPUT:
Input of 0 = Parallel to Serial, 1 = Serial to Parallel.
In Host Control Mode, pin is an OUTPUT:
EDE300 drives this pin low on receive, high on transmit
0 = 2400 BAUD, (N 8 1); 1 = 9600 BAUD, (N 8 1)
0 = Local Control Mode, 1 = Host Control Mode
Serial data is output from the EDE300 via this pin
Serial data is input to the EDE300 via this pin
Data I/O Pins (DO is least significant bit)
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COPYRIGHT © 1996 E-Lab Digital Engineering, Inc. All Rights Reserved. Page # 1
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E-LAB Digital Engineering
E-LAB Digital Engineering

EDE300 Datasheet Preview

EDE300 Datasheet

Parallel / Serial Transceiver IC

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EDE300 pdf
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Clock/ Power Pins:
OSC1,OSC2 (PIN 16,PIN 15):
Power (PIN 14,PIN 4):
Ground (PIN 5):
4 MHz Resonator Connection
Connect to +5 VDC
Connect to 0 VDC (GND)
LOCAL CONTROL MODE
In Local Control Mode, enabled by wiring the Mode pin low (Pin 3), directional control is
selected by the condition of the Dir/Latch pin (Pin 1). When Local Control Mode is selected and the
Dir/Latch pin is low, the EDE300 acts as a Parallel to Serial transmitter, continually reading the 8 data
pins (D0..D7) and sending this value out the serial XMIT pin (Pin 18). When Local Control Mode is
selected and the Dir/Latch pin is high, the EDE300 acts as a Serial to Parallel receiver, continually
monitoring the RCV pin (Pin 17) and latching the received data onto the 8 data pins (D0..D7).
NOTE: Switching the Dir/Latch pin causes the data I/O pins (D0..D7) to switch from inputs to outputs
and vice-versa. Care should be taken that data is not input into the 8 data pins while the EDE300 is
in Serial to Parallel mode (Pin 17 high); otherwise damage may occur to the EDE300 or the external
circuitry as both attempt to drive the I/O pins. See the Host Control Mode section's schematics for
details on switching the data inputs and outputs with the EDE300. The following schematics depict
the EDE300 in a basic, unidirectional hookup, transmitting (Figure One) and receiving (Figure Two)
data to and from a PC via the PC serial port COM 1.
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Figure One: Unidirectional Serial Transmission to PC
The following code, written in ‘Turbo C’, illustrates the reception of the EDE300’s data stream. It can
be used in conjunction with the hardware setup in Figure One.
#include <stdio.h>
char data;
main()
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/* 8 BIT VARIABLE TO HOLD INCOMING DATA */
COPYRIGHT © 1996 E-Lab Digital Engineering, Inc. All Rights Reserved. Page # 2
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Part Number EDE300
Description Parallel / Serial Transceiver IC
Maker E-LAB Digital Engineering
Total Page 9 Pages
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