ST75951 datasheet(14/21 Pages) STMICROELECTRONICS

14 / 21 page

FUNCTIONAL DESCRIPTION (continued)

11.2 - Read Operation (Register n) (D15 = 1)

This is a two sampling frequency period duration

operation, where a first 16 bit word sent from the

host on DIN, contains the read qualifier and the

address register (register n).

Contemporaly ST75951 ouptuts on DOUT the regis-

ter 2 (GPIO) while the address field is decoded.

Then a second read operation with the default

address (register 2) is sent to the device. At that

DATA WORD INPUT

@regN (read only)

D15

DATA WORD OUTPUT

HC0

HC1

Sampling Period

1/2 Sampling Period

DATA WORD OUTPUT

D15

Sampling Period

1/2 Sampling Period

@reg2 (read only)

DATA WORD INPUT

Figure 23

R/W

ad2

ad1

ad0

d11...............d0

D15

16 Bits Control Word Format

Figure 24

DATA WORD INPUT (15 BITS)

DATA WORD OUPUT (16 BITS)

SCLK

(Only if Control Mode Selected)

D15

DIN

D15

DOUT

D15

DATA WORD INPUT (15 BITS)

D15

DIN

D15

CONTROL WORD (16 BITS)

D15

DOUT

DATA WORD OUPUT (16 BITS)

HC1 = 0

HC0 = 0

D15

DIN

D15

DOUT

DATA WORD OUPUT (16 BITS)

DATA WORD INPUT (16 BITS)

D15

CONTROL WORD (16 BITS)

D15

DIN

D15

DOUT

DATA WORD OUPUT (16 BITS)

DATA WORD INPUT (16 BITS)

HC1 = 0

HC0 = 1

HC1 = 1

HC0 = X

1/2 Sampling Period

Sampling Period, (128, 192, 256, 320 or 384)

Figure 25

time ST75951 outputs on DOUT the register n

value (see Figure 23, 24 and 25).

ST75951

14/21

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