L9803 STMicroelectronics, L9803 Datasheet - Page 36

• Manufacturer Part Number: L9803
• Description: Super Smart Power Motor Driver With 8-bit Mcu, Ram, Eeprom, Adc, Wdg, Timers, Pwm And H-bridge Driver
• Manufacturer: STMicroelectronics

On-Chip Peripherals
Note:
Caution:
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1
Table 6.
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.
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.
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
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS
Warning:
I/O Port Configurations
PAD
PAD
PAD
The analog input voltage level must be within the limits
stated in the absolute maximum ratings.
V
V
V
DD
R
DD
DD
R
R
PU
PU
PU
Figure
PULL-UP
CONFIGURATION
Hardware Configuration
17. Other transitions are potentially risky and should
INTERRUPT
CONFIGURATION
OTHER
FROM
PINS
ALTERNATE
ALTERNATE
REGISTER
ENABLE
ENABLE
DR
DR REGISTER ACCESS
REGISTER
REGISTER
SELECTION
POLARITY
DR
DR
DR REGISTER ACCESS
DR REGISTER ACCESS
W
R
ALTERNATE
ALTERNATE
OUTPUT
OUTPUT
ALTERNATE INPUT
EXTERNAL INTERRUPT
SOURCE (ei
ANALOG INPUT
R/W
R/W
DATA BUS
DATA BUS
DATA BUS
x
)
L9803