L9803 STMicroelectronics, L9803 Datasheet - Page 100

• 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
5.9
5.9.1
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The following table summarizes the driving mode selection made by PWM_EN, IN1 and IN2
bit
Bit 4= DIR: Direction bit. This bit is meaningless when PWM_EN=0. When PWM_EN is set
the DIR bit controls the “driving direction” of the bridge. In order to implement a precise
control of the direction changes, DIR value is latched by the rising edge of the pwm signal
driving the bridge. When the signal does not have edges (i.e. pwm = 0% or 100%) the DIR
bit can not be latched and the driving direction does not change even changing DIR bit in
BCSR.
Bit 5= SC: Short Circuit flag (read only)
Bit 6= OVT: Overtemperature flag (read only)
Bit 7= PIE: Power section interrupt enable.
EEPROM (EEP)
Introduction
The Electrically Erasable Programmable Read Only Memory is used to store data that need
a non volatile back-up. The use of the EEPROM requires a basic protocol described in this
chapter.
Software or hardware reset and halt modes are managed immediately, stopping the action
in progress. Wait mode does not affect the programming of the EEPROM.
The Read operation of this memory is the same of a Read-Only-Memory or RAM. The erase
and programming cycles are controlled by an EEPROM control register.
The user can program 1 to 4 bytes at the same programming cycle providing that the high
part of the address is the same for the bytes to be written (only address bits A1 and A0 can
change).
The EEPROM is mono-voltage. A charge pump generates the high voltage internally to
enable the erase and programming cycles. The erase and programming cycles are chained
automatically. The global programming cycle duration is controlled by an internal circuit.
PWM_EN
0
1
1
1
1
IN1
X
0
0
1
1
IN2
X
0
1
0
1
Direct
PWM1 Up Braking
PWM1 Down Braking
PWM1 Symmetrical
PWM1/PWM2
Driving Mode
L9803