XR88C681CP/40-F Exar Corporation, XR88C681CP/40-F Datasheet - Page 24

• Manufacturer Part Number: XR88C681CP/40-F
• Description: IC UART CMOS DUAL 40PDIP
• Manufacturer: Exar Corporation
• Type: CMOS Dual Channel UARTr

Specifications of XR88C681CP/40-F

• Number Of Channels: 2, DUART
• Package / Case: 40-DIP (0.600", 15.24mm)
• Features: *
• Fifo's: 1 Byte, 3 Byte
• Voltage - Supply: 5V
• With Parallel Port: Yes
• With Cmos: Yes
• Mounting Type: Through Hole
• Data Rate: 1 Mbps
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 4.75 V
• Supply Current: 15 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: Through Hole
• Operating Supply Voltage: 5 V
• Propagation Delay Time Ns: 400 ns
• No. Of Channels: 2
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: DIP
• No. Of Pins: 40
• Filter Terminals: DIP
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 1016-1328-5

C.6.1.1 8051 Microcontroller
The 8051 family of microcontrollers is manufactured by Intel and comes with a variety of amenities. Some of these
amenities include:
D On chip serial port
D Four 8 bit I/O port (P0 - P3)
D Two 16 bit timers
D 4k bytes of ROM
D 128 bytes of RAM
Figure 3 presents a block diagram of the 8051 microcontroller, and Figure 4 presents the pin out of this device.
Rev. 2.11
Oscillator
Interrupt
Control
CPU
RST
-EA
-INT1
-INT0
Timer 2 (8032/8052)
Timer 1
Timer 0
Serial Port
Figure 3. Block Diagram of the 8051 Microcontroller
Registers
Other
Bus Control
(8032/8052)
128 bytes
-PSEN
ALE
128 bytes
RAM
RAM
P 0
24
P1
I/O Ports
0K - 8031/8032
4K - 8051
8K - 8052
P2
ROM
P3
(8032/8052)
-RXD
Timer 1
Timer 0
Timer 2
Serial Port
-TXD
-T2EX
-T2
-T1
-T0