l4969 STMicroelectronics, l4969 Datasheet - Page 16

• Manufacturer Part Number: l4969
• Description: System Voltage Regulator With Fault Tolerant Low Speed Can-transceiver
• Manufacturer: STMicroelectronics

L4969
1.10.2 Address/Command Field
The Address/Command field starts with a 2-Bit start sequence consisting of ‘01’. Any other sequence will lead
to a protocol error signalled via the NINT. The addressfield is specifying the register to be accessed. The SPI
command flags allow in addition to the normal read/write operation to clear the Interrupt flag register after read.
1.10.3 Datafield #1
Datafield #1 contains either the lower 8 bits of a 12-Bit frame or the complete byte of an 8-Bit transfer.
Note, that SOUT is always showing the content of the register currently accessed and not a copy of SIN as dur-
ing the Address/ Command field.
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Frame start sequence
always has to be
transmitted as 0 1
7
0
99AT0017
D7
1
ADR3
D6
SIN: Data to write
SOUT: Data currently in selected register
Addressfield specifying
the Control/Status word
to be accessed
D5
ADR2
Lower 8 Bit of 12 Bit data
D4
ADR1
D3
ADR0
D2
C1
SPI command:
00: Read register
01: Clear IFR
10: illegal command
11: Write register
D1
0
C0
D0