L9803 datasheet(36/126 Pages) STMICROELECTRONICS

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On-Chip Peripherals

L9803

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Table 6.

I/O Port Configurations

Note:

1. When the I/O port is in input configuration and the associated alternate function is

enabled as an output, reading the DR register will read the alternate function output status.

2. When the I/O port is in output configuration and the associated alternate function is

enabled as an input, the alternate function reads the pin status given by the DR register

content.

Caution:

The alternate function must not be activated as long as the pin is configured as input with

interrupt, in order to avoid generating spurious interrupts.

Warning:

The analog input voltage level must be within the limits

stated in the absolute maximum ratings.

The hardware implementation on each I/O port depends on the settings in the DDR and OR

registers and specific feature of the I/O port.Switching these I/O ports from one state to

another should be done in a sequence that prevents unwanted side effects. Recommended

safe transitions are illustrated in Figure 17. Other transitions are potentially risky and should

Hardware Configuration

CONFIGURATION

PAD

VDD

RPU

EXTERNAL INTERRUPT

POLARITY

DATA BUS

PULL-UP

INTERRUPT

DR REGISTER ACCESS

FROM

OTHER

PINS

SOURCE (eix)

SELECTION

CONFIGURATION

ALTERNATE INPUT

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

ANALOG INPUT

PAD

RPU

DATA BUS

DR REGISTER ACCESS

R/W

VDD

ALTERNATE

ENABLE

OUTPUT

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

PAD

RPU

DATA BUS

DR REGISTER ACCESS

R/W

VDD

ALTERNATE

ENABLE

OUTPUT

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

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