ST6385 datasheet(28/84 Pages) STMICROELECTRONICS

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ST6365, ST6375, ST6385 ST6367, ST6377, ST6387

I/O PORTS (Cont’d)

4.1.1 Details of I/O Ports

When programmed as an input a pull-up resistor (if

available) can be switched active under program

control. When programmed as an output the I/O

port will operate either in the push-pull mode or the

open-drain mode according to the hardware fixed

configuration as specified below.

Port A. PA0-PA3 are available as push-pull when

outputs. PA4-PA7 are available as open-drain (no

push-pull programmability) capable of withstand-

ing 12V (no resistive pull-up in input mode). PA6-

PA7 has been specially designed for higher driving

capability and are able to sink 25mA with a maxi-

mum VOL of 1V.

Port B. All lines are configured as push-pull when

outputs.

Port C. PC0-PC3 are available as open-drain ca-

pable of withstanding a maximum VDD+0.3V.

PC4-PC7 are avail-able as open-drain capable of

withstanding 12V (no resistive pull-up in input

mode). Some lines are also used as I/O buffers for

signals coming from the on-chip SPI.

In this case the final signal on the output pin is

equivalent to a wired AND with the programmed

data output.

If the user needs to use the serial peripheral, the I/

O line should be set in output mode while the

open-drain configuration is hardware fixed; the

corresponding data bit must set to one. If the

latched

interrupt

functions

are

used

(IRIN,

PWRIN) then the corresponding pins should be

set to input mode.

On ST638x the I/O pins with double or special

functions are:

– PC0/SCL (connected to the SPI clock signal)

– PC1/SDA (connected to the SPI data signal)

– PC3/SEN (connected to the SPI enable signal)

– PC4/PWRIN (connected to the PWRIN interrupt

latch)

– PC6/IRIN (connected to the IRIN interrupt latch)

All the Port A,B and C I/O lines have Schmitt-trig-

ger input configuration with a typical hysteresis of

1V.

Table 8. I/O Port Options Selection (Ports A and B only)

Note X: Means don’t care.

DDR

Mode

Option

Input

With on-chip pull-up resistor

Input

Without on-chip pull-up resistor

Output

Output open-drain or push-pull

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