ST6369 datasheet(29/71 Pages) STMICROELECTRONICS

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Figure 28. I/O Configuration Diagram

(Open Drain 12V)

Figure 29. I/O Configuration Diagram (Open Drain 5V, Push-pull)

Input/Output Configurations

The following schematics show the I/O lines hard-

ware configuration for the different options. Fig-

ure 28 shows the I/O configuration for an I/O pin

with open-drain 12V capability (standard drive and

high drive). Figure 29 shows the I/O configuration

for an I/O pin with push-pull and with open drain 5V

capability.

Notes :

The WAIT instruction allows the ST6369 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. The unavailable I/O

lines PB0, PB3 and PB7 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.

INPUT/OUTPUT PORTS (Continued)

ST6369

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