Rainbow-electronics MAX3301E Instrukcja Użytkownika Pobierz pdf (Strona 20)

MAX3301E

USB On-the-Go Transceiver and Charge Pump

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the master to send the next data byte. The MAX3301E

sends an acknowledge bit after each data byte. If an

unsupported register is selected, the MAX3301E sends

a NACK to the master and the register index does not

increment (see Figure 20).

Burst-Mode Read Byte Format

The MAX3301E allows a master device to read data

from sequential registers with the burst-mode read byte

protocol (see Figure 21). The master device first sends

the slave address, followed by a zero. The MAX3301E

then sends an acknowledge bit. Next, the master sends

the register address to the MAX3301E, which then gen-

erates another acknowledge bit. The master then sends

a stop (P) condition to the MAX3301E. Next, the master

sends a start condition, followed by the MAX3301E’s

slave address, and then a one to indicate a read com-

mand. The MAX3301E then sends data to the master

device, one byte at a time. The master sends an

acknowledge bit to the MAX3301E after each data byte,

and the register address of the MAX3301E increments

after each byte. This continues until the master sends a

stop (P) condition. If an unsupported register address is

encountered, the MAX3301E sends a byte of zeros.

SLAVE ADDRESS

(7 BITS)

A6 A5 A4 A3 A2 A1 A0 0

(8 BITS)

MSB LSB

DATA (K)

(8 BITS)

DATA (K+1)

(8 BITS)

DATA (K+2)

(8 BITS)

MSB LSB

DATA (K+N)

(8 BITS)

MSB LSB

SLAVE ADDRESS

(7 BITS)

A6 A5 A4 A3 A2 A1 A0 0

UNSUPPORTED REGISTER ADDRESS (K)

(8 BITS)

MSB LSB

ANA

MSB LSB

DATA (K)

(8 BITS)

MAX3301E RECOGNIZES

ITS ADDRESS

MAX3301E SENDS

AN ACK

MAX3301E RECOGNIZES A WRITE TO AN

UNSUPPORTED LOCATION, THEN SENDS A NACK

R/W

Figure 20. Burst-Mode Write Byte Format

SLAVE ADDRESS

(7 BITS)

A6 A5 A4 A3 A2 A1 A0 0 0 0

(8 BITS)

MSB LSB

SLAVE ADDRESS

(7 BITS)

A6 A5 A4 A3 A2 A1 A0 1 1 00

DATA

(8 BITS)

MSB LSB

NA P

R/W

Figure 19. Read Byte Format

R/W: Read/write (R/W = 1: read; R/W = 0: write)

S: Start condition

RS: Repeated start condition

P: Stop condition

A: Acknowledge bit from the slave

NA: Not-acknowledged bit from the master

Blank: Master transmission

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 32 33

MAX3301E 1

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