ISP1301 datasheet(26/46 Pages) PHILIPS

26 / 46 page

Philips Semiconductors

ISP1301

USB OTG transceiver

Product data

Rev. 01 — 14 April 2004

26 of 46

9397 750 11355

13. I2C-bus protocol

For detailed information, refer to

The I2C-bus speciﬁcation; version 2.1.

13.1 I2C-bus byte transfer format

[1]

S = Start; A = Acknowledge; P = Stop.

13.2 I2C-bus device address

13.3 Write format

A write operation can be performed as:

• One-byte write to the speciﬁed register address

• Multi-byte write to N consecutive registers, starting from the speciﬁed start

address. N deﬁnes the number of registers to write. If N = 1, only the start register

is written.

13.3.1

One-byte write

Figure 12 illustrates the byte sequence.

Table 33:

I2C-bus byte transfer format[1]

Byte 1

Byte 2

Byte 3

…

8 bits

…

Table 34:

Device address byte 1

Bit

device address

Name

R/W

Value

Table 35:

Bit description

Bit

Symbol Description

7 to 1

A[6:0]

Device address: The device address of the ISP1301 is: 0101 10 (A0).

The value of A0 (LSB) is loaded from pin ADR/PSW during reset

(including power-on reset). If pin ADR/PSW = HIGH, bit A0 = 1;

otherwise bit A0 = 0.

R/W

Read/write command.

0 — write

1 — read.

Table 36:

Transfer format description for one-byte write

Byte

Description

master starts with a START condition

Device select

master transmits device address and write command bit R/W = 0

ACK

slave generates an acknowledgment

master transmits address of register K

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