L9779WD datasheet(136/170 Pages) STMICROELECTRONICS

136 / 170 page

Functional description

L9779WD

136/170

DocID027452 Rev 5

Note:

Pay attention to the fact that the LSB is always transmitted first.

RD_DATA1, 2, 3, 4, 5, 6, 7 and 8

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'.

Table 64. RD_DATA1, 2, 3, 4, 5, 6, 7 and 8

Command

CSB

C(5..0)

CD(7..0)

RD_DATA1

0 0 0 0 1 1

X X X X X X X X

RD_DATA2

0 0 0 1 0 1

X X X X X X X X

RD_DATA3

0 0 0 1 1 0

X X X X X X X X

RD_DATA4

0 0 1 0 0 1

X X X X X X X X

RD_DATA5

0 0 1 0 1 0

X X X X X X X X

RD_DATA6

0 0 1 1 0 0

X X X X X X X X

RD_DATA7

1 0 1 1 0 1

X X X X X X X X

RD_DATA8

1 0 1 1 1 0

X X X X X X X X

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