COM20051 View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
Manufacturer
COM20051
SMSC -> Microchip
COM20051 Datasheet PDF : 92 Pages
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PIN NO.
1
4-11
12
19
21
22-28
30
29
3,17,31
37
38-45
46
47
48
57
58-65
DESCRIPTION OF PIN FUNCTIONS
NAME
SYMBOL
DESCRIPTION
Receive In
RXIN
Input. Network receiver input.
P1.0-1.7
P1.0-1.7
Input/Output. Port 1 of the 80C32. General
purpose digital I/O port.
Reset
RESET
Input. Active high reset.
P3.0
P3.0
Input/Output. Port 3 bit 0 of the 8051. RX input of
serial port.
nPulse 1
nPULSE1
Output. Network output. Open-drain when
backplane mode is invoked, otherwise it is a push-
pull output.
P3.1-3.7
P3.1-3.7
Input/Output. Port 3 bits 1-7 of the 8051.
Crystal
Oscillator
XTAL1
Input. Oscillator input 1.
Crystal
Oscillator
XTAL2
Input. Oscillator input 2.
Ground
VSS
Ground pin.
nPulse 2
nPULSE2
Output. Network output. Outputs a synchronous
clock at 2x the data rate when backplane mode is
invoked.
P2.0-2.7
P2.0-2.7
Input/Output. Port 2 of the 8051. High order
address bus.
nProgram Store nPSEN
Enable
Output.
Address Latch ALE
Enable
Output.
Transmit
Enable
TXEN
Output. Active high signal that goes active
whenever data is being transmitted. This signal will
remain low whenever the TXEN bit of the network
controller is reset.
nExternal
nEA/EMUL
Address
Enable/Emulate
Enable
Input. When high, causes the 8051's outputs to tri-
state. When low, allows the 8051 to address
external memory. Must be low to execute code
from the embedded 8051.
P0.7-0.0
P0.7-0.0
Input/Output. Port 0 of the 8051. Multiplexed low
order address/data bus.
5
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