ST7FLITE02 STMICROELECTRONICS [STMicroelectronics], ST7FLITE02 Datasheet - Page 44

• Manufacturer Part Number: ST7FLITE02
• Description: 8-BIT MICROCONTROLLER WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST7LITE0x, ST7LITESx
Output Modes
The output configuration is selected by setting the
corresponding DDR register bit. In this case, writ-
ing the DR register applies this digital value to the
I/O pin through the latch. Then reading the DR reg-
ister returns the previously stored value.
Two different output modes can be selected by
software through the OR register: Output push-pull
and open-drain.
DR register value and output pin status:
Note: When switching from input to output mode,
the DR register has to be written first to drive the
correct level on the pin as soon as the port is con-
figured as an output.
44/125
1
– reset the interrupt mask with the RIM instruc-
DR
tion (in cases where a pin level change could
occur)
0
1
Push-pull
V
V
DD
SS
Open-drain
Floating
Vss
10.2.2 Alternate Functions
When an on-chip peripheral is configured to use a
pin, the alternate function is automatically select-
ed. This alternate function takes priority over the
standard I/O programming under the following
conditions:
– When the signal is coming from an on-chip pe-
– When the signal is going to an on-chip peripher-
Notes:
– Input pull-up configuration can cause unexpect-
– When an on-chip peripheral use a pin as input
ripheral, the I/O pin is automatically configured in
output mode (push-pull or open drain according
to the peripheral).
al, the I/O pin must be configured in floating input
mode. In this case, the pin state is also digitally
readable by addressing the DR register.
ed value at the input of the alternate peripheral
input.
and output, this pin has to be configured in input
floating mode.