L9803 STMicroelectronics, L9803 Datasheet - Page 87

• 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

L9803
Read/Write
Reset Value: Undefined
ID[10:3] are the most significant 8 bits of the 11-bit message identifier.The identifier acts as
the message’s name, used for bus access arbitration and acceptance filtering.
IDENTIFIER LOW REGISTERS (IDLRx)
Read/Write
Reset Value: Undefined
ID[2:0] are the least significant 3 bits of the 11-bit message identifier.
RTR is the Remote Transmission Request bit. It is set to indicate a remote frame and reset
to indicate a data frame.
DLC[3:0] is the Data Length Code. It gives the number of bytes in the data field of the
message.The valid range is 0 to 8.
DATA REGISTERS (DATA0-7x)
Read/Write
Reset Value: Undefined
DATA[7:0] is a message data byte. Up to eight such bytes may be part of a message.
Writing to byte DATA7 initiates a transmit request and should always be done even when
DATA7 is not part of the message.
BUFFER CONTROL/STATUS REGs. (BCSRx)
Read/Write
Reset Value: 00h
Bit 3 = ACC Acceptance Code
−
Set by hardware with the id of the highest priority filter which accepted the message stored
in the buffer.
Read Only
DATA7
ID10
ID2
7
7
7
7
0
DATA6
ID9
ID1
0
DATA5
ID8
ID0
0
DATA4
RTR
ID7
0
DATA3
DLC3
ACC
ID6
DATA2
DLC2
RDY
ID5
On-Chip Peripherals
DATA1
BUSY
DLC1
ID4
DATA0
LOCK
DLC0
ID3
0
0
0
0
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