L9779WD Datasheet, PDF (136/170 Pages) STMicroelectronics – Multifunction IC for engine management system

Functional description
L9779WD
Note:
Pay attention to the fact that the LSB is always transmitted first.
RD_DATA1, 2, 3, 4, 5, 6, 7 and 8
Command
RD_DATA1
RD_DATA2
RD_DATA3
RD_DATA4
RD_DATA5
RD_DATA6
RD_DATA7
RD_DATA8
Table 64. RD_DATA1, 2, 3, 4, 5, 6, 7 and 8
CSB
C(5..0)
1
000011
1
000101
1
000110
1
001001
1
001010
1
001100
1
101101
1
101110
CD(7..0)
XXXXXXXX
XXXXXXXX
XXXXXXXX
XXXXXXXX
XXXXXXXX
XXXXXXXX
XXXXXXXX
XXXXXXXX
CSB : command selection bit - always '1'
C(5...0) : command bit
CD(7...0): command data bit
READ_DATA1 initiates 4 upstream communications that transfer data block 1 that consists
of the registers CONFIG_REG1, CONFIG_REG2, CONFIG_REG3 and CONFIG_REG4,
transmitted exactly in this order.
READ_DATA2 initiates 4 upstream communications that transfer data block 2 that consists
of the registers CONFIG_REG5, CONFIG_REG6, CONFIG_REG7, not used, transmitted
exactly in this order.
READ_DATA3 initiates 4 upstream communications that transfer data block 3 that consists
of the registers DIA_REG1, DIA_REG2, DIA_REG3 and DIA_REG4, transmitted exactly in
this order.
READ_DATA4 initiates 4 upstream communications that transfer data block 4 that consists
of the registers DIA_REG5, DIA_REG6, DIA_REG7 and DIA_REG8, transmitted exactly in
this order.
READ_DATA5 initiates 4 upstream communications that transfer data block 5 that consists
of the registers DIA_REG9, DIA_REG10, DIA_REG11 and IDENT_REG, transmitted exactly
in this order.
READ_DATA6 initiates 4 upstream communications that transfer data block 6 that consists
of the registers WDA_QUERY, not used, STEP_CTN_H and STEP_CTN_L.
READ_DATA7 initiates 4 upstream communications that transfer data block 7 that consists
of the registers DIA_REG12, DIA_REG12, RESP, and WDA_RESPTIME.
READ_DAT8 initiates 4 upstream communications that transfer data block 7 that consists of
the registers WDA_RESPTIME, REQULO, REQUHI, RST_AB1_CNT.
The command has no relevant data as command data bit - they may be set to '1' or '0'.
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