Octagon 6000 Series, User Manual

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6-14
EZ I/O 6000 Series user’s manual
Table 6-11 EZ I/O port addressing
Port I/O address
A Base address
B Base a 1*
C Base a 2
Control register Base a 3
*Port B can only be configured as output on the 6050.
The output level is inverted from input. This is due to
the inverted-output, high-current driver used on the
6050. Consider these factors when using and
programming this port.
Programming EZ I/O
Program the EZ I/O chip as follows:
1. Configure the bit directions.
2. Write to port A, B, or C with the desired level, or read the bit
level from the desired port.
Configuring EZ I/O
Configure the EZ I/O chip as follows:
1. Write a “2” to the control register (base 3). This places
the I/O chip into the “direction” mode:
OUT 143H, 2 (control register)
2. Set the direction of each bit. A “0” bit to the corresponding
line indicates an output. A “1” bit indicates an input. Each bit
corresponds to the equivalent I/O line.
Table 6-12 EZ I/O port byte
EZ I/O port byte EZ I/O port
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 I/O line
x 7
x 6
x 5
x 4
x 3
x 2
x 1
x 0
For example, writing 00011100 to port C (base 2) will configure
port C I/O lines 0, 1, 5, 6, and 7 to be inputs and lines 2, 3, and 4 to be
outputs: