L9803 STMicroelectronics, L9803 Datasheet - Page 68

• 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
5.4.3
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Figure 33. Impedance at PWMO/I pin
PWMI
PWMI is an input line, directly connected to PB2 bit. The circuit translates the voltage levels
referred to VB voltage supply to the internal logic levels (see
on PWMI pin is higher than VB/2 PB2 reads an high logic level.
If the bit PWMI in DCSR register is set (see
the Input Capture 2 on Timer 2, which is otherwise connected in alternate function to PA7
(see
An internal pull down current generator (5µA) allows to detect the Open Bus condition
(external pull up missing).
If the battery or ground connection are lost, the PWMI line shows a controlled impedance
characteristic (see
Figure 34. PWMI function
Describe the register DCSR (0022h) as reported in Table 1.
Figure
PA7
PWMI
34).
Figure
PA(7)
PB(2)
PORT
PWM
I/O
50KΩ
34).
PA(7) ALTERNATE INPUT
PWM INPUT
5µA
I
K
DCSR
Section
14V
3.2.1), PWMI is directly connected with
0
1
PIEN
M
U
X
Figure
50KΩ
V
K
32). When the voltage
ICAP2
TIMER 2
L9803