User i/o pins, 8051 trainer headers connection – Digilent 6014-210-000-KIT User Manual
Page 3
8051 Reference Manual
Digilent, Inc.
www.digilentinc.com
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User I/O Pins
The 8051 Trainer board has two rows of
male and female connector for user to access
all the ports of the 8051 microcontroller
(DS89C450) plus 8 LEDs and 8 switched
available via 8 pin male and female sip
connectors.
8051 Trainer Headers Connection
Note: All 8051 ports can be used as general purpose I/Os or for the following specific purposes.
Connector
Description
8051 Trainer 20 Pins Header to
DS89C450 Ports / Bit
Pin
Function
Port / Bit
J2 and J4
P0
(Pin 2-9)
External memory bus
These pins are accessible for I/O operation. Also
they can be connected to the multiplexed
Address/Data line of the DS89C450 for external
memory bus interface.
1
VCC
2
AD0
P0.0
3
AD1
P0.1
4
AD2
P0.2
5
AD3
P0.3
6
AD4
P0.4
7
AD5
P0.5
8
AD6
P0.6
9
AD7
P0.7
10
11
ALE
12
PSEN
J2 and J4
P2
(Pin 13-20)
External memory bus
These pins are accessible for I/O operation. They
can be connected to the higher order address pins
of the external memory bus interface.
13
A8
P2.0
14
A9
P2.1
15
A10
P2.2
16
A11
P2.3
17
A12
P2.4
18
A13
P2.5
19
A14
P2.6
20
A15
P2.7
J1 and J3
P1
(Pin 1-8)
PORT1 is used for I/O operation. If jumper S1 and
S2 are connected P1.2 and P1.3 should not be
externally used because P1.2 and P1.3 are
connected to Max232. To be able to connect P1.2
and P1.3 to an external device you must disconnect
the S1 and S2 jumpers
.
1
I/O
P1.0
2
I/O
P1.1
3
I/O
P1.2
4
I/O
P1.3
5
I/O
P1.4
6
I/O
P1,5
7
I/O
P1.6
8
I/O
P1.7
9
J1 and J3
P1
(Pin 10-17)
Serial port communications and interrupts
Asynchronous serial port, UART0, as well as the
8051 external interrupt sources are part of this port
Connection to Serial#0 is used on this port for an
RS232 serial interface. This is used for
programming (downloading) the hex file to
DS89C450 chip. No device can be connected to
P3.0 and P3.1 during programming.
10
RxD0
P3.0
11
TxD0
P3.1
12
INT0I
P3.2
13
INT1
P3.3
14
T0
P3.4
15
T1
P3.5
16
WR
P3.6
17
RD
P3.7
18
19
20
GND