STCN75

Functional description

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3.6

WRITE mode

In this mode the master transmitter transmits to the STCN75 slave receiver. Bus protocol is

shown in Figure 11. Following the START condition and slave address, a logic '0' (R/W = 0)

is placed on the bus and indicates to the addressed device that word address will follow and

is to be written to the on-chip address pointer.

These modes are shown in the WRITE mode typical timing diagrams (see Figure 11, and

Figure 12, and Figure 13 on page 24).

Figure 11.

Typical pointer set followed by an immediate READ from the

configuration register

Figure 12.

Configuration register WRITE

AI12230

19

1

9

Repeat

Start

by

Master

ACK

by

STCN75

No ACK

by

STCN75

Stop

Cond.

by

Master

1

0

0

1

A2 A1 A0

D7 D6 D5 D4 D3 D2 D1 D0

R/W

Address Byte

Data Byte

11

99

1

Start

by

Master

Address Byte

Pointer Byte

ACK

by

STCN75

ACK

by

STCN75

0

0

1

A2 A1 A0 R/W

0

0

0

0

0

0

D1 D0

AI12231

11

99

1

9

1

Start

by

Master

Address Byte

Pointer Byte

ACK

by

STCN75

ACK

by

STCN75

ACK

by

STCN75

Stop

Cond.

by

Master

00

1

A2

A1

A0

R/W

00

0

0

0

0

0

0

0

D4

D3

D2

D1 D0

D1

D0

Configuration Byte