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ST6391 View Datasheet(PDF) - STMicroelectronics

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ST6391 Datasheet PDF : 68 Pages
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ST6391,92,93,95,97,99
INPUT/OUTPUT PORTS (Continued)
Input/Output Configurations
The following schematics show the I/O lines hard-
ware configuration for the different options. Figure
30 shows the I/O configuration for an I/O pin with
open-drain 12V capability (standard drive and high
drive). Figure 31 shows the I/O configuration for an
I/O pin with push-pull and with open drain 5V capa-
bility.
Figure 30. I/O Configuration Diagram
(Open Drain 12V)
Notes :
The WAIT instruction allows the ST639x to be
used in situations where low power consumption is
needed. This can only be achieved however if the
I/O pins either are programmed as inputs with well
defined logic levels or have no power consuming
resistive loads in output mode. As the same die is
used for the different ST639x versions the unavail-
able I/O lines of ST639x should be programmed in
output mode.
Single-bit operations on I/O registers are possible
but care is necessary because reading in input
mode is made from I/O pins while writing will di-
rectly affect the Port data register causing an unde-
sired changes of the input configuration.
Figure 31. I/O Configuration Diagram (Open Drain 5V, Push-pull)
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